/ В. В. Вальков, А. Д. Федосеев // Изв. РАН. Сер. физич. - 2013. - Т. 77, № 3. - С. 387-389DOI 10.7868/S0367676513030381
. -
Аннотация: Исследован энергетический спектр подвижных носителей заряда в двумерном антиферромагнетике, помещенном во внешнее магнитное поле. Показано, что учет скоса магнитных подрешеток модифицирует эффективную массу подвижных носителей заряда слаболегированного антиферромагнетика. Этот факт существенным образом сказывается на транспортных и термодинамических свойствах системы. Обнаружено явление перехода в полуметаллическую фазу под воздействием внешнего магнитного поля.
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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Федосеев, Александр Дмитриевич; Fedoseev, A. D.; Val'kov, V. V.
Труды сотрудников института физики
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Теплоемкость и магнитосопротивление слаболегированного двумерного антиферромагнетика в неколлинеарной фазе
Несоизмеримые магнитные структуры ромбоэдрического гейзенберговского антиферромагнетика
/ С. Н. Мартынов // Письма в Журн. эксперим. и теор. физ. - 2013. - Т. 98, Вып. 1. - С. 23-27DOI 10.7868/S0370274X13130055
. -
Аннотация: Для ромбоэдрического антиферромагнетика симметрии R3m с фрустрированным обменом в базисной плоскости и конкуренцией обменов между ближайшими и вторыми соседними плоскостями рассчитана фазовая диаграмма основного состояния. Диаграмма содержит фазы коллинеарного антиферромагнитного упорядочения разных типов, разделенные пятью несоизмеримыми магнитными состояниями геликоидального типа, различающимися по типу упорядочения и направлению вектора модуляции. Соизмеримые и несоизмеримые фазы сходятся в мультикритических точках, лежащих на линии, соответствующей антиферромагнетику с неискаженной простой кубической решеткой.
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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Martynov S. N.
Аннотация: Для ромбоэдрического антиферромагнетика симметрии R3m с фрустрированным обменом в базисной плоскости и конкуренцией обменов между ближайшими и вторыми соседними плоскостями рассчитана фазовая диаграмма основного состояния. Диаграмма содержит фазы коллинеарного антиферромагнитного упорядочения разных типов, разделенные пятью несоизмеримыми магнитными состояниями геликоидального типа, различающимися по типу упорядочения и направлению вектора модуляции. Соизмеримые и несоизмеримые фазы сходятся в мультикритических точках, лежащих на линии, соответствующей антиферромагнетику с неискаженной простой кубической решеткой.
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Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Martynov S. N.
Incommensurate magnetic structures in rhombohedral Heisenberg antiferromagnet
/ S. N. Martynov // JETP Letters. - 2013. - Vol. 98, Is. 1. - P. 19-23, DOI 10.1134/S0021364013140099. - Cited References: 31
. - 5. - ISSN 0021-3640
Аннотация: The phase diagram of the ground state has been calculated for a rhombohedral antiferromagnet of the R3m symmetry with frustrated exchange in the base plane and competition of exchanges between the nearest and next-nearest planes. The diagram contains phases of collinear antiferromagnetic ordering of various types separated by five incommensurate magnetic states of the helicoidal type, differing in the ordering type and in the direction of the modulation vector. The commensurate and incommensurate phases converge at multi-critical points lying on a line corresponding to an antiferromagnet with an undistorted simple cubic lattice.
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Доп.точки доступа:
Мартынов, Сергей Николаевич
Аннотация: The phase diagram of the ground state has been calculated for a rhombohedral antiferromagnet of the R3m symmetry with frustrated exchange in the base plane and competition of exchanges between the nearest and next-nearest planes. The diagram contains phases of collinear antiferromagnetic ordering of various types separated by five incommensurate magnetic states of the helicoidal type, differing in the ordering type and in the direction of the modulation vector. The commensurate and incommensurate phases converge at multi-critical points lying on a line corresponding to an antiferromagnet with an undistorted simple cubic lattice.
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Мартынов, Сергей Николаевич
Heat capacity and magnetoresistance of a lightly doped two-dimensional antiferromagnet in the noncollinear phase
/ V. V. Val'Kov, A. D. Fedoseev // Bull. Russ. Acad. Sci.: Phys. - 2013. - Vol. 77, Is. 3. - P. 349-351, DOI 10.3103/S1062873813030386
. - ISSN 1062-8738
Аннотация: The energy spectrum of mobile charge carriers in a two-dimensional Antiferromagnet placed in external magnetic field is analyzed. It is shown that allowing for the magnetic sublattice skew the effective mass of mobile charge carriers in a lightly doped Antiferromagnet. This affects substantially the transport and thermodynamic properties of the system. A insulator-semimetal transition is induced with external magnetic field. В© 2013 Allerton Press, Inc.
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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Доп.точки доступа:
Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Вальков, Валерий Владимирович
Аннотация: The energy spectrum of mobile charge carriers in a two-dimensional Antiferromagnet placed in external magnetic field is analyzed. It is shown that allowing for the magnetic sublattice skew the effective mass of mobile charge carriers in a lightly doped Antiferromagnet. This affects substantially the transport and thermodynamic properties of the system. A insulator-semimetal transition is induced with external magnetic field. В© 2013 Allerton Press, Inc.
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Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Доп.точки доступа:
Fedoseev, A. D.; Федосеев, Александр Дмитриевич; Вальков, Валерий Владимирович
Incommensurate structures in a two-subsystem partially frustrated ferrimagnet
/ S. N. Martynov // JETP Letters. - 2012. - Vol. 95, Is. 4. - P. 188-192, DOI 10.1134/S0021364012040066. - Cited References: 23. - This work was supported by the Russian Foundation for Basic Research (project no. 10-02-00765).
. - ISSN 0021-3640
РУБ Physics, Multidisciplinary
Аннотация: A new incommensurate magnetic structure with a locally triangular orientation of spins has been proposed for a two-subsystem magnet with frustrated intersystem exchange and competition between exchanges in one of the subsystems. When the temperature is lowered, this structure appears from the antiferromagnetic state after a first-order phase transition. It transfers to the Yafet-Kittel triangular structure when the threshold conditions for the exchange interactions are fulfilled. An increase in the length of the frustrated exchange bonds leads to the appearance of an incommensurate phase with the local antiferromagnetic orientation of the sublattices in each subsystem between the commensurate antiferromagnetic and Yafet-Kittel phases.
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Доп.точки доступа:
Мартынов, Сергей Николаевич
Аннотация: A new incommensurate magnetic structure with a locally triangular orientation of spins has been proposed for a two-subsystem magnet with frustrated intersystem exchange and competition between exchanges in one of the subsystems. When the temperature is lowered, this structure appears from the antiferromagnetic state after a first-order phase transition. It transfers to the Yafet-Kittel triangular structure when the threshold conditions for the exchange interactions are fulfilled. An increase in the length of the frustrated exchange bonds leads to the appearance of an incommensurate phase with the local antiferromagnetic orientation of the sublattices in each subsystem between the commensurate antiferromagnetic and Yafet-Kittel phases.
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Мартынов, Сергей Николаевич
Basis states and collective excitations of nonlocal three-spin polarons over the singlet phase of the CuO2 plane
/ V. V. Val'kov, D. M. Dzebisashvili, A. F. Barabanov // JETP Letters. - 2012. - Vol. 95, Is. 4. - P. 206-212, DOI 10.1134/S0021364012040091. - Cited References: 15. - This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Physics of Mesoscopic and Disordered Systems"), the Russian Foundation for Basic Research (project nos. 10-02-00251 and 11-02-98007-r-sibir'), and the Ministry of Education and Science of the Russian Federation (federal program "Human Capital for Science and Education in Innovative Russia" for 2009-2013).
. - ISSN 0021-3640
РУБ Physics, Multidisciplinary
Аннотация: An orthonormalized basis describing the single-hole states of the CuO2 plane has been constructed exactly taking into account the p-d exchange coupling between the spins of a hole and the two nearest copper ions. The introduced basis makes it possible to include the effects caused by the dependence of the Heisenberg interaction between the nearest copper ions on the occupation of the intermediate oxygen ion by the hole in the calculation of the spectrum of the collective excitations of nonlocal three-spin polarons. The inclusion of this correlation, as well as the nonlocality of the p-d exchange coupling, is the main difference of the developed approach to the description of the energy structure from the calculations with the use of the Zhang-Rice singlet.
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Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Dzebisashvili, D. M.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Barabanov, A. F.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
Аннотация: An orthonormalized basis describing the single-hole states of the CuO2 plane has been constructed exactly taking into account the p-d exchange coupling between the spins of a hole and the two nearest copper ions. The introduced basis makes it possible to include the effects caused by the dependence of the Heisenberg interaction between the nearest copper ions on the occupation of the intermediate oxygen ion by the hole in the calculation of the spectrum of the collective excitations of nonlocal three-spin polarons. The inclusion of this correlation, as well as the nonlocality of the p-d exchange coupling, is the main difference of the developed approach to the description of the energy structure from the calculations with the use of the Zhang-Rice singlet.
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Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Dzebisashvili, D. M.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Barabanov, A. F.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
The Faraday effect in TbFe3(BO3)4 and TbAl3(BO3)4 borates
/ V. A. Bedarev [et al.] // J. Magn. Magn. Mater. - 2014. - Vol. 362. - P. 150-153, DOI 10.1016/j.jmmm.2014.03.034. - Cited References: 16
. - ISSN 0304-8853. - ISSN 1873-4766
РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Аннотация: The magnetic field dependences of the Faraday rotation of light and the magnetization of antiferromagnet TbFe3(BO3)(4) and paramagnet TbAl3(BO3)(4) compounds have been investigated. It is established that the main contribution to the Faraday rotation in the TbFe3(BO3)(4) is associated with the Tb3+ subsystem at low temperatures. The antiferromagnetic ordering effects on this contribution is shown. (C) 2014 Elsevier B.V. All rights reserved.
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Держатели документа:
Natl Acad Sci Ukraine, B Verkin Inst Low Temperature Phys & Engn, UA-61103 Kharkov, Ukraine
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Bedarev, V. A.; Pashchenko, M. I.; Merenkov, D. N.; Savina, Y. O.; Pashchenko, V. O.; Gnatchenko, S. L.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович
Аннотация: The magnetic field dependences of the Faraday rotation of light and the magnetization of antiferromagnet TbFe3(BO3)(4) and paramagnet TbAl3(BO3)(4) compounds have been investigated. It is established that the main contribution to the Faraday rotation in the TbFe3(BO3)(4) is associated with the Tb3+ subsystem at low temperatures. The antiferromagnetic ordering effects on this contribution is shown. (C) 2014 Elsevier B.V. All rights reserved.
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Держатели документа:
Natl Acad Sci Ukraine, B Verkin Inst Low Temperature Phys & Engn, UA-61103 Kharkov, Ukraine
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Bedarev, V. A.; Pashchenko, M. I.; Merenkov, D. N.; Savina, Y. O.; Pashchenko, V. O.; Gnatchenko, S. L.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Temerov, V. L.; Темеров, Владислав Леонидович
Cluster size and shape effect on the electronic structure of the Hubbard model within the norm-conserving cluster perturbation theory
/ A. Krinitsyn, S. Nikolaev, S. G. Ovchinnikov // J. Supercond. Nov. Magn. - 2014. - Vol. 27, Is. 4. - P. 955-963, DOI 10.1007/s10948-013-2418-7. - Cited References: 59. - This work was supported by Grants NSh-1044.2012.2 and MK-1168.2012.2, Siberian Federal University: Grant F-11, and the Presidium of RAS Program 20.7.
. - ISSN 1557-1939. - ISSN 1557-1947
РУБ Physics, Applied + Physics, Condensed Matter
Аннотация: Within a new norm-conserving approach to the cluster perturbation theory (CPT) for the 2d Hubbard model we study the effect of the cluster size and shape on the electronic structure. We have compared two type of clusters, 4-cluster (2x2) and 5-cluster (cruciform of 5 atoms). With 4-cluster we can treat exactly the first and second neighbours correlations, C (1) and C (2). With 5-cluster the third neighbour correlations C (3) are also treated exactly. The band structure in the CPT with 4- and 5-clusters differs remarkably. The quasiparticle spectral weight map for 5-clusters is very similar to the Quantum Monte Carlo (QMC) and the variational CPT data. With increasing doping, small hole Fermi surface transforms into conventional Fermi-liquid type large Fermi surface through Lifshitz quantum phase transitions.
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Держатели документа:
Dostoyevsky Omsk State Univ, Omsk 644077, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Nikolaev, S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Siberian Federal University [F-11]; Presidium of RAS Program [20.7]; [NSh-1044.2012.2]; [MK-1168.2012.2]
Рубрики:
NARROW ENERGY-BANDS
CUPRATE SUPERCONDUCTORS
PHOTOEMISSION SPECTRA
PSEUDOGAP
ANTIFERROMAGNET
EXCITATIONS
EVOLUTION
SYSTEMS
PHASE
STATE
Кл.слова (ненормированные):
Cluster perturbation theory -- Hubbard model -- Strong correlations -- Density of states -- Fermi surface
NARROW ENERGY-BANDS
CUPRATE SUPERCONDUCTORS
PHOTOEMISSION SPECTRA
PSEUDOGAP
ANTIFERROMAGNET
EXCITATIONS
EVOLUTION
SYSTEMS
PHASE
STATE
Кл.слова (ненормированные):
Cluster perturbation theory -- Hubbard model -- Strong correlations -- Density of states -- Fermi surface
Аннотация: Within a new norm-conserving approach to the cluster perturbation theory (CPT) for the 2d Hubbard model we study the effect of the cluster size and shape on the electronic structure. We have compared two type of clusters, 4-cluster (2x2) and 5-cluster (cruciform of 5 atoms). With 4-cluster we can treat exactly the first and second neighbours correlations, C (1) and C (2). With 5-cluster the third neighbour correlations C (3) are also treated exactly. The band structure in the CPT with 4- and 5-clusters differs remarkably. The quasiparticle spectral weight map for 5-clusters is very similar to the Quantum Monte Carlo (QMC) and the variational CPT data. With increasing doping, small hole Fermi surface transforms into conventional Fermi-liquid type large Fermi surface through Lifshitz quantum phase transitions.
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Держатели документа:
Dostoyevsky Omsk State Univ, Omsk 644077, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Nikolaev, S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Siberian Federal University [F-11]; Presidium of RAS Program [20.7]; [NSh-1044.2012.2]; [MK-1168.2012.2]
Magnetic field-induced phase transitions in the antiferromagnet Nd 0.6Dy0.4Fe3(BO3)4
/ G. A. Zvyagina [et al.] // Low Temp. Phys. - 2014. - Vol. 40, Is. 2. - P. 146-150, DOI 10.1063/1.4865561. - Cited References: 17
. - ISSN 1063-777X. - ISSN 1090-6517
РУБ Physics, Applied
Аннотация: Low-temperature studies of elastic and magnetic characteristics of the single crystal Nd0.6Dy0.4Fe3(BO3)4 have been performed. A transition to the antiferromagnetically ordered state of the magnetic subsystem has been manifested in the temperature behavior of the velocity and attenuation of acoustic modes and magnetization. Spin-reorientation phase transitions, which reveal themselves as anomalies in the behavior of elastic and magnetic characteristics of the crystal in the external magnetic field applied along the axis of the trigonal symmetry of the crystal have been discovered. The phase H–T diagram for H || C 3 has been constructed.
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Держатели документа:
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
Russian Acad Sci, Siberian Branch, LV Kirenskiy Inst Phys, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Zvyagina, G. A.; Zhekov, K. R.; Bilych, I. V.; Zvyagin, A. A.; Bludov, A. N.; Pashchenko, V. A.; Gudim, I. A.; Гудим, Ирина Анатольевна
Аннотация: Low-temperature studies of elastic and magnetic characteristics of the single crystal Nd0.6Dy0.4Fe3(BO3)4 have been performed. A transition to the antiferromagnetically ordered state of the magnetic subsystem has been manifested in the temperature behavior of the velocity and attenuation of acoustic modes and magnetization. Spin-reorientation phase transitions, which reveal themselves as anomalies in the behavior of elastic and magnetic characteristics of the crystal in the external magnetic field applied along the axis of the trigonal symmetry of the crystal have been discovered. The phase H–T diagram for H || C 3 has been constructed.
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Держатели документа:
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
Russian Acad Sci, Siberian Branch, LV Kirenskiy Inst Phys, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Zvyagina, G. A.; Zhekov, K. R.; Bilych, I. V.; Zvyagin, A. A.; Bludov, A. N.; Pashchenko, V. A.; Gudim, I. A.; Гудим, Ирина Анатольевна
Magnetic field-induced phase transitions in the antiferromagnet Nd 0.6Dy0.4Fe3(BO3)4
/ G. A. Zvyagina [et al.] // Физ. низких температур : Fizika Nizkikh Temperatur. - 2014. - Т. 40, Вып. 2. - С. 187-192. - Библиогр.: 17 назв.
. - ISSN 0132-6414
Кл.слова (ненормированные):
rare earth ferroborates -- magnetoelastic coupling -- magnetic phase transitions
Аннотация: Low-temperature studies of elastic and magnetic characteristics of the single crystal Nd0.6Dy0.4Fe3(BO3)4 have been performed. A transition to the antiferromagnetically ordered state of the magnetic subsystem has been manifested in the temperature behavior of the velocity and attenuation of acoustic modes and magnetization. Spin-reorientation phase transitions, which reveal themselves as anomalies in the behavior of elastic and magnet-ic characteristics of the crystal in the external magnetic field applied along the axis of the trigonal symmetry of the crystal have been discovered. The phase H-T diagram for H || C 3 has been constructed.
Были выполнены низко-температурные исследования упругих и магнитных особенностей монокристалла Nd0.6Dy0.4Fe3 (BO3) 4. Переход к антиферромагнитно упорядоченному состоянию магнитной подсистемы был проявлен в температурном поведении скорости и ослаблении акустических мод и намагничивании. Были обнаружены фазовые спин-переориентационные переходы, которые показывают себя как аномалии в поведении упругих и магнитных особенностей кристалла во внешнем магнитном поле, приложенном вдоль оси треугольной симметрии кристалла. Фаза диаграмма H–T для H || С3 была построена.
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Держатели документа:
[Zvyagina, G. A.
Zhekov, K. R.
Bilych, I. V.
Zvyagin, A. A.
Bludov, A. N.
Pashchenko, V. A.] Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
[Zvyagin, A. A.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Gudim, I. A.] Russian Acad Sci, Siberian Branch, LV Kirenskiy Inst Phys, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Zvyagina, G. A.; Zhekov, K. R.; Bilych, I. V.; Zvyagin, A. A.; Bludov, A. N.; Pashchenko, V. A.; Gudim, I. A.; Гудим, Ирина Анатольевна
Кл.слова (ненормированные):
rare earth ferroborates -- magnetoelastic coupling -- magnetic phase transitions
Аннотация: Low-temperature studies of elastic and magnetic characteristics of the single crystal Nd0.6Dy0.4Fe3(BO3)4 have been performed. A transition to the antiferromagnetically ordered state of the magnetic subsystem has been manifested in the temperature behavior of the velocity and attenuation of acoustic modes and magnetization. Spin-reorientation phase transitions, which reveal themselves as anomalies in the behavior of elastic and magnet-ic characteristics of the crystal in the external magnetic field applied along the axis of the trigonal symmetry of the crystal have been discovered. The phase H-T diagram for H || C 3 has been constructed.
Были выполнены низко-температурные исследования упругих и магнитных особенностей монокристалла Nd0.6Dy0.4Fe3 (BO3) 4. Переход к антиферромагнитно упорядоченному состоянию магнитной подсистемы был проявлен в температурном поведении скорости и ослаблении акустических мод и намагничивании. Были обнаружены фазовые спин-переориентационные переходы, которые показывают себя как аномалии в поведении упругих и магнитных особенностей кристалла во внешнем магнитном поле, приложенном вдоль оси треугольной симметрии кристалла. Фаза диаграмма H–T для H || С3 была построена.
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Держатели документа:
[Zvyagina, G. A.
Zhekov, K. R.
Bilych, I. V.
Zvyagin, A. A.
Bludov, A. N.
Pashchenko, V. A.] Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
[Zvyagin, A. A.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Gudim, I. A.] Russian Acad Sci, Siberian Branch, LV Kirenskiy Inst Phys, Krasnoyarsk 660036, Russia
Доп.точки доступа:
Zvyagina, G. A.; Zhekov, K. R.; Bilych, I. V.; Zvyagin, A. A.; Bludov, A. N.; Pashchenko, V. A.; Gudim, I. A.; Гудим, Ирина Анатольевна
Influence of triplet states on the spectrum of collective spin-polaron excitations in a 2D kondo lattice
/ V. V. Val'kov [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 10. - P. 1997-2000, DOI 10.1134/S1063783411100337. - Cited References: 10. - This study was supported by the Presidium of the Russian Academy of Sciences (Program "Quantum Physics of Condensed Matter"), the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration project no. 53), the Ministry of Education and Science of the Russian Federation (Russian Federal Targeted Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia" in 2009-2013), and the Russian Foundation for Basic Research (projects nos. 09-02-00127, 10-02-00614).
. - ISSN 1063-7834
РУБ Physics, Condensed Matter
Аннотация: The normal and superconducting phases of the ensemble of spin polarons in a two-dimensional Kondo lattice have been considered under the conditions when the hopping integral is comparable to the s-d exchange interaction energy. The polaron excitation spectrum and the superconducting transition temperature have been found taking into account upper triplet states. The change in the concentration dependence of the critical temperature of the transition to the superconducting phase with the relation between the hopping integral and the integral of the s-d exchange coupling has been analyzed.
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Держатели документа:
[Val'kov, V. V.
Shklyaev, A. A.
Korovushkin, M. M.] Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Barabanov, A. F.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Moscow Oblast, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660014, Russian Federation
Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow oblast 142092, Russian Federation
Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Shklyaev, A. A.; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.
Аннотация: The normal and superconducting phases of the ensemble of spin polarons in a two-dimensional Kondo lattice have been considered under the conditions when the hopping integral is comparable to the s-d exchange interaction energy. The polaron excitation spectrum and the superconducting transition temperature have been found taking into account upper triplet states. The change in the concentration dependence of the critical temperature of the transition to the superconducting phase with the relation between the hopping integral and the integral of the s-d exchange coupling has been analyzed.
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Держатели документа:
[Val'kov, V. V.
Shklyaev, A. A.
Korovushkin, M. M.] Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Barabanov, A. F.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Moscow Oblast, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660014, Russian Federation
Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow oblast 142092, Russian Federation
Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Shklyaev, A. A.; Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.
Quantum fluctuations in a two-dimensional antiferromagnet with four-spin interaction of cubic symmetry
/ V. V. Val'kov, T. A. Val'kova, A. A. Shklyaev // Phys. Solid State. - 2011. - Vol. 53, Is. 10. - P. 2061-2066, DOI 10.1134/S1063783411100350. - Cited References: 13. - This study was supported by the Presidium of the Russian Academy of Sciences (Program "Quantum Physics of Condensed Matter"), the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration project no. 53), the Ministry of Education and Science of the Russian Federation (Russian Federal Targeted Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia" in 2009-2013), and the Russian Foundation for Basic Research (project no. 09-02-00127).
. - ISSN 1063-7834
РУБ Physics, Condensed Matter
Аннотация: The excitation spectrum of a non-Heisenberg 2D antiferromagnet with the four-spin interaction of cubic symmetry has been calculated in the first order of 1/2S. It has been shown that, for weak anisotropy, the N,el state is destroyed by quantum fluctuations. The phase diagrams showing the stability regions of the N,el phase in the space of spin-anisotropy parameters have been plotted.
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Держатели документа:
[Val'kov, V. V.
Shklyaev, A. A.] Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Val'kova, T. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660014, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation
Доп.точки доступа:
Val'kova, T. A.; Shklyaev, A. A.; Вальков, Валерий Владимирович
Аннотация: The excitation spectrum of a non-Heisenberg 2D antiferromagnet with the four-spin interaction of cubic symmetry has been calculated in the first order of 1/2S. It has been shown that, for weak anisotropy, the N,el state is destroyed by quantum fluctuations. The phase diagrams showing the stability regions of the N,el phase in the space of spin-anisotropy parameters have been plotted.
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Держатели документа:
[Val'kov, V. V.
Shklyaev, A. A.] Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Val'kova, T. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk 660014, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation
Доп.точки доступа:
Val'kova, T. A.; Shklyaev, A. A.; Вальков, Валерий Владимирович
Parameters of the transition layer in the exchange-biased NiFe/DyCo film structure
/ G. I. Frolov, V. A. Seredkin, V. Y. Yakovchuk // Phys. Solid State. - 2011. - Vol. 53, Is. 7. - P. 1348-1352, DOI 10.1134/S1063783411070109. - Cited References: 19. - This study was supported the Ministry of Education and Science of the Russian Federation within the Analytic Department Targeted Program "Development of the Scientific Potential of the Higher School" (project nos. RNP 2.1.1/4399 and RNP 2.1.1/3498).
. - ISSN 1063-7834
РУБ Physics, Condensed Matter
Аннотация: The parameters of the transition layer in exchange-biased film structures are necessary agents to understand the mechanism of formation of unidirectional anisotropy. The layer thickness in NiFe/DyCo films has been determined by comparison of signals of the polar magneto-optical Kerr effect from a reference DyCo film and a hard magnetic layer of the exchange-biased structure. The layer thickness obtained is one order of magnitude larger than that characteristic of ferromagnet-antiferromagnet bilayer films. The mechanism of magnetization reversal of the structure under study has been explained within the model suggesting the formation of 180A degrees boundaries in the interface.
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Держатели документа:
[Frolov, G. I.
Seredkin, V. A.
Yakovchuk, V. Yu.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Frolov, G. I.
Seredkin, V. A.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Yakovchuk, V. Yu.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii rabochii 31, Krasnoyarsk 660014, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation
Доп.точки доступа:
Seredkin, V. A.; Середкин, Виталий Александрович; Yakovchuk, V. Y.; Фролов, Георгий Иванович
Аннотация: The parameters of the transition layer in exchange-biased film structures are necessary agents to understand the mechanism of formation of unidirectional anisotropy. The layer thickness in NiFe/DyCo films has been determined by comparison of signals of the polar magneto-optical Kerr effect from a reference DyCo film and a hard magnetic layer of the exchange-biased structure. The layer thickness obtained is one order of magnitude larger than that characteristic of ferromagnet-antiferromagnet bilayer films. The mechanism of magnetization reversal of the structure under study has been explained within the model suggesting the formation of 180A degrees boundaries in the interface.
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Держатели документа:
[Frolov, G. I.
Seredkin, V. A.
Yakovchuk, V. Yu.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Frolov, G. I.
Seredkin, V. A.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Yakovchuk, V. Yu.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, pr. im. Gazety Krasnoyarskii rabochii 31, Krasnoyarsk 660014, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation
Доп.точки доступа:
Seredkin, V. A.; Середкин, Виталий Александрович; Yakovchuk, V. Y.; Фролов, Георгий Иванович
From underdoped to overdoped cuprates: two quantum phase transitions
/ S. G. Ovchinnikov, E. I. Shneyder, M. M. Korshunov // J. Phys.: Condens. Matter. - 2011. - Vol. 23, Is. 4. - Ст. 45701, DOI 10.1088/0953-8984/23/4/045701. - Cited References: 58. - We would like to thank S Sakai for useful discussions. The authors acknowledge support by the Russian Foundation for Basic Research (grant N 09-02-00127), by the Integration Program of SBRAS N40, the Presidium RAS Program 5.7, President of Russia (grant MK-1683.2010.2), FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK P891), and in part by the National Science Foundation under grant NSF PHY05-51164.
. - ISSN 0953-8984
РУБ Physics, Condensed Matter
Аннотация: Several experimental and theoretical studies indicate the existence of a critical point separating the underdoped and overdoped regions of the high-T-c cuprates' phase diagram. There are at least two distinct proposals on the critical concentration and its physical origin. The first one is associated with the pseudogap formation for p < p*, with p* approximate to 0.2. The other relies on the Hall effect measurements and suggests that the critical point and the quantum phase transition (QPT) take place at optimal doping, p(opt) approximate to 0.16. Here we have performed a precise density of states calculation and found that there are two QPTs and the corresponding critical concentrations associated with the change of the Fermi surface topology upon doping.
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Держатели документа:
[Ovchinnikov, S. G.
Shneyder, E. I.
Korshunov, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Korshunov, M. M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Department of Physics, University of Florida, Gainesville, FL 32611, United States
Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Korshunov, M. M.; Коршунов, Максим Михайлович; Овчинников, Сергей Геннадьевич
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
T-J MODEL
CORRELATED FERMION SYSTEMS
VALENCE BOND STATE
MEAN-FIELD-THEORY
CRITICAL-POINT
HEISENBERG-ANTIFERROMAGNET
EXCITATIONS
PSEUDOGAP
OSCILLATIONS
Кл.слова (ненормированные):
Critical concentration -- Critical points -- Cuprates -- Density of state -- Fermi surface topology -- Hall effect measurement -- High-T -- Optimal doping -- Overdoped -- Pseudo-gap -- Quantum phase transitions -- Theoretical study -- Copper compounds -- Hall effect -- Magnetic field effects -- Phase diagrams -- Phase transitions
HIGH-TEMPERATURE SUPERCONDUCTORS
T-J MODEL
CORRELATED FERMION SYSTEMS
VALENCE BOND STATE
MEAN-FIELD-THEORY
CRITICAL-POINT
HEISENBERG-ANTIFERROMAGNET
EXCITATIONS
PSEUDOGAP
OSCILLATIONS
Кл.слова (ненормированные):
Critical concentration -- Critical points -- Cuprates -- Density of state -- Fermi surface topology -- Hall effect measurement -- High-T -- Optimal doping -- Overdoped -- Pseudo-gap -- Quantum phase transitions -- Theoretical study -- Copper compounds -- Hall effect -- Magnetic field effects -- Phase diagrams -- Phase transitions
Аннотация: Several experimental and theoretical studies indicate the existence of a critical point separating the underdoped and overdoped regions of the high-T-c cuprates' phase diagram. There are at least two distinct proposals on the critical concentration and its physical origin. The first one is associated with the pseudogap formation for p < p*, with p* approximate to 0.2. The other relies on the Hall effect measurements and suggests that the critical point and the quantum phase transition (QPT) take place at optimal doping, p(opt) approximate to 0.16. Here we have performed a precise density of states calculation and found that there are two QPTs and the corresponding critical concentrations associated with the change of the Fermi surface topology upon doping.
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Держатели документа:
[Ovchinnikov, S. G.
Shneyder, E. I.
Korshunov, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Korshunov, M. M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Department of Physics, University of Florida, Gainesville, FL 32611, United States
Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Korshunov, M. M.; Коршунов, Максим Михайлович; Овчинников, Сергей Геннадьевич
Ground state of an antiferromagnet with uniform antisymmetric exchange in a magnetic field
/ S. N. Martynov, V. I. Tugarinov // JETP Letters. - 2010. - Vol. 92, Is. 2. - P. 115-119, DOI 10.1134/S0021364010140092. - Cited References: 12
. - ISSN 0021-3640
РУБ Physics, Multidisciplinary
Аннотация: A system of two nonlinear differential equations for sublattice angles is proposed to describe the spin orientation distribution in a planar antiferromagnet with uniform antisymmetric exchange in a magnetic field. This system involves the initial symmetry of the problem and is reduced to a single delay differential equation. The solutions of this system are parameterized by the initial condition imposed on the angle of one sublattice at the hyperbolic singular point of the phase space. The numerical analysis of the stability boundary of soliton solutions demonstrates that the transition to the commensurate phase takes place outside the region where the stochastic solutions appear and is accompanied by the magnetization jump Delta m similar to 10(-1) m.
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Держатели документа:
[Martynov, S. N.
Tugarinov, V. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Мартынов, Сергей Николаевич
Аннотация: A system of two nonlinear differential equations for sublattice angles is proposed to describe the spin orientation distribution in a planar antiferromagnet with uniform antisymmetric exchange in a magnetic field. This system involves the initial symmetry of the problem and is reduced to a single delay differential equation. The solutions of this system are parameterized by the initial condition imposed on the angle of one sublattice at the hyperbolic singular point of the phase space. The numerical analysis of the stability boundary of soliton solutions demonstrates that the transition to the commensurate phase takes place outside the region where the stochastic solutions appear and is accompanied by the magnetization jump Delta m similar to 10(-1) m.
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Держатели документа:
[Martynov, S. N.
Tugarinov, V. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Мартынов, Сергей Николаевич
Effective Interactions and the Nature of Cooper Instability of Spin Polarons in the 2D Kondo Lattice
/ V. V. Val'kov, M. M. Korovushkin, A. F. Barabanov // JETP Letters. - 2008. - Vol. 88, Is. 6. - P. 370-374, DOI 10.1134/S0021364008180069. - Cited References: 9. - This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Microphysics"), the Russian Foundation for Basic Research (project no. 06-02-16100), and the Siberian Branch, Russian Academy of Sciences (integration project no. 3.4). The work of M. M. Korovushkin was supported by the Krasnoyarsk Regional Science Foundation (project no. 18G).
. - ISSN 0021-3640
РУБ Physics, Multidisciplinary
Аннотация: It has been shown that two- and three-center interactions arise in the strong-coupling regime for the 2D Kondo lattice; these interactions both induce and suppress the Cooper instability. It is important that, in contrast to the t-J* model, the three- center interactions promote the Cooper pairing and ensure the appearance of the superconducting phase with a high critical temperature T(c). The calculated concentration dependences of T(c) agree well with the experimental data for the cuprate superconductors.
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Держатели документа:
[Val'kov, V. V.
Korovushkin, M. M.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Val'kov, V. V.] Siberian State Airspace Univ, Krasnoyarsk 660074, Russia
[Barabanov, A. F.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Siberian State Airspace University, Krasnoyarsk 660074, Russian Federation
Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region 142190, Russian Federation
Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
Аннотация: It has been shown that two- and three-center interactions arise in the strong-coupling regime for the 2D Kondo lattice; these interactions both induce and suppress the Cooper instability. It is important that, in contrast to the t-J* model, the three- center interactions promote the Cooper pairing and ensure the appearance of the superconducting phase with a high critical temperature T(c). The calculated concentration dependences of T(c) agree well with the experimental data for the cuprate superconductors.
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Держатели документа:
[Val'kov, V. V.
Korovushkin, M. M.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Val'kov, V. V.] Siberian State Airspace Univ, Krasnoyarsk 660074, Russia
[Barabanov, A. F.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Siberian State Airspace University, Krasnoyarsk 660074, Russian Federation
Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region 142190, Russian Federation
Доп.точки доступа:
Korovushkin, M. M.; Коровушкин, Максим Михайлович; Barabanov, A. F.; Вальков, Валерий Владимирович
Magnetic structures upon ordering of e(g) orbitals in a square lattice
/ S. S. Aplesnin, A. I. Moskvin // J. Phys.: Condens. Matter. - 2008. - Vol. 20, Is. 32. - Ст. 325202, DOI 10.1088/0953-8984/20/32/325202. - Cited References: 11
. - ISSN 0953-8984
РУБ Physics, Condensed Matter
Аннотация: The exchange mechanism effect on the ordering of electrons on e(g) orbitals in a two-dimensional Heisenberg model with exchange anisotropy for a S = 1/2 spin is determined. The regions of existence of long-range quasi-one- and two-dimensional antiferromagnetic order with the special exchange topology are calculated by a quantum Monte Carlo method. The Neel temperature and quantum reduction of spin on site for an antiferromagnet with the stripe structure is estimated as a function of exchange anisotropy.
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Держатели документа:
[Aplesnin, S. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Moskvin, A. I.] MF Reshetneva Aircosm Siberian State Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
M. F. Reshetneva Aircosmic Siberian State University, Krasnoyarsk, 660014, Russian Federation
Доп.точки доступа:
Moskvin, A. I.; Аплеснин, Сергей Степанович
Рубрики:
HEISENBERG-ANTIFERROMAGNET
S=1/2
PHASE
Кл.слова (ненормированные):
Crystallography -- Exchange mechanisms -- Magnetic structure
HEISENBERG-ANTIFERROMAGNET
S=1/2
PHASE
Кл.слова (ненормированные):
Crystallography -- Exchange mechanisms -- Magnetic structure
Аннотация: The exchange mechanism effect on the ordering of electrons on e(g) orbitals in a two-dimensional Heisenberg model with exchange anisotropy for a S = 1/2 spin is determined. The regions of existence of long-range quasi-one- and two-dimensional antiferromagnetic order with the special exchange topology are calculated by a quantum Monte Carlo method. The Neel temperature and quantum reduction of spin on site for an antiferromagnet with the stripe structure is estimated as a function of exchange anisotropy.
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Держатели документа:
[Aplesnin, S. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Moskvin, A. I.] MF Reshetneva Aircosm Siberian State Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
M. F. Reshetneva Aircosmic Siberian State University, Krasnoyarsk, 660014, Russian Federation
Доп.точки доступа:
Moskvin, A. I.; Аплеснин, Сергей Степанович
Frustration mechanism of formation of a helical magnetic structure in the CuB2O4 two-subsystem antiferromagnet
/ S. N. Martynov, A. D. Balaev // JETP Letters. - 2007. - Vol. 85, Is. 12. - P. 649-654, DOI 10.1134/S0021364007120132. - Cited References: 21
. - ISSN 0021-3640
РУБ Physics, Multidisciplinary
Аннотация: A new mechanism is proposed for forming an incommensurate magnetic structure of the transverse helix type owing to the removal of frustration through intersubsystem exchange in a two-subsystem antiferromagnet. The symmetry analysis of the distribution of the Dzyaloshinskii-Moriya interaction and comparison with the experimental data on the field dependence of magnetization indicate that antisymmetric exchange and competition between symmetric exchanges cannot be responsible for forming a helical magnetic structure in CuB2O4.
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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Balaev, A. D.; Балаев, Александр Дмитриевич; Мартынов, Сергей Николаевич
Аннотация: A new mechanism is proposed for forming an incommensurate magnetic structure of the transverse helix type owing to the removal of frustration through intersubsystem exchange in a two-subsystem antiferromagnet. The symmetry analysis of the distribution of the Dzyaloshinskii-Moriya interaction and comparison with the experimental data on the field dependence of magnetization indicate that antisymmetric exchange and competition between symmetric exchanges cannot be responsible for forming a helical magnetic structure in CuB2O4.
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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Balaev, A. D.; Балаев, Александр Дмитриевич; Мартынов, Сергей Николаевич
Magnetic structure and magnetic excitations in the two-dimensional spin system of the Cu3B2O6 compound
/ G. A. Petrakovskii [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 7. - P. 1315-1320, DOI 10.1134/S1063783407070207. - Cited References: 21
. - ISSN 1063-7834
РУБ Physics, Condensed Matter
Аннотация: This paper reports on the results of measurements of the magnetic susceptibility, heat capacity, neutron scattering, muon spin relaxation, and electron paramagnetic resonance in Cu3B2O6 for the study of the ground state of the spin system of this compound. The results obtained suggest that, at a temperature of 10 K, the spin subsystem of the crystal, which consists of single spins and clusters of pairs and fours of spins interacting with one another, undergoes a transition to a state representing a superposition of the singlet (for clusters) and magnetically ordered (for single spins) states.
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Держатели документа:
LV Kirenskii Inst Phys, Siberian Div, Russian Acad Sci, Krasnoyarsk 660036, Russia
Paul Scherrer Inst, Villigen, Switzerland
Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Paul-Scherrer Institute, Villigen, Switzerland
Institute of Physics, Polish Academy of Sciences, Warsaw 02-668, Poland
Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Popov, M. A.; Schefer, J.; Neidermayer, C.; Aleshkevich, P.; Szymczak, R.
Рубрики:
LONG-RANGE ORDER
HEISENBERG-MODEL
GROUND-STATE
GAP
ANTIFERROMAGNET
SRCU2(BO3)(2)
CUGEO3
CHAINS
CAV4O9
LONG-RANGE ORDER
HEISENBERG-MODEL
GROUND-STATE
GAP
ANTIFERROMAGNET
SRCU2(BO3)(2)
CUGEO3
CHAINS
CAV4O9
Аннотация: This paper reports on the results of measurements of the magnetic susceptibility, heat capacity, neutron scattering, muon spin relaxation, and electron paramagnetic resonance in Cu3B2O6 for the study of the ground state of the spin system of this compound. The results obtained suggest that, at a temperature of 10 K, the spin subsystem of the crystal, which consists of single spins and clusters of pairs and fours of spins interacting with one another, undergoes a transition to a state representing a superposition of the singlet (for clusters) and magnetically ordered (for single spins) states.
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Держатели документа:
LV Kirenskii Inst Phys, Siberian Div, Russian Acad Sci, Krasnoyarsk 660036, Russia
Paul Scherrer Inst, Villigen, Switzerland
Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Paul-Scherrer Institute, Villigen, Switzerland
Institute of Physics, Polish Academy of Sciences, Warsaw 02-668, Poland
Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Popov, M. A.; Schefer, J.; Neidermayer, C.; Aleshkevich, P.; Szymczak, R.
A quantum spin liquid in a two-layer triangular antiferromagnet
/ R. S. Gekht, I. N. Bondarenko // J. Exp. Theor. Phys. - 2005. - Vol. 101, Is. 5. - P. 868-880, DOI 10.1134/1.2149066. - Cited References: 43
. - ISSN 1063-7761
РУБ Physics, Multidisciplinary
Аннотация: The possibility of implementing a quantum-spin-liquid-type state in a two-layer triangular spin-1/2 antiferromagnet at T = 0 is investigated. The ratio of intra- to interlayer exchange constants (j) is found under which a transition from the classical state with 120 degrees triangular order to a quantum state with zero magnetization per site occurs; in this case, the spins of adjacent layers form singlets that are separated from triplet excitations by an energy gap. Compared with an analogous system with the square lattice, the range of j in which the classical ordered state is realized turns out to be an order of magnitude smaller due to the effects of frustration; in this case, the behavior of thermodynamic quantities is analogous, on the whole, to that in two-layer square lattices; a difference manifests itself in the behavior of the gap in the spectrum of quasiparticles in an external magnetic field h. For small fields h, a j-h phase diagram is constructed that determines the domains in which the 120 degrees and the singlet phases exist. It is established that, in the neighborhood of the second-order phase transition, the contribution, to the thermodynamic quantities, of longitudinal spin fluctuations, which are disregarded in the spin-wave description, is comparable to the contribution of transverse fluctuations. (c) 2005 Pleiades Publishing, Inc.
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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Доп.точки доступа:
Bondarenko, I. N.
Рубрики:
ONE-DIMENSIONAL ANTIFERROMAGNETS
DIMER GROUND-STATE
MEAN-FIELD THEORY
HEISENBERG-ANTIFERROMAGNET
SYSTEM SRCU2(BO3)(2)
PHASE-TRANSITION
GAP
FLUCTUATIONS
EXCITATIONS
LATTICE
Кл.слова (ненормированные):
Antiferromagnetic materials -- Magnetic fields -- Magnetization -- Phase diagrams -- Spectrum analysis -- Thermodynamics -- Analogous systems -- Square lattices -- Thermodynamic quantities -- Two-layer triangular antiferromagnets -- Quantum theory
ONE-DIMENSIONAL ANTIFERROMAGNETS
DIMER GROUND-STATE
MEAN-FIELD THEORY
HEISENBERG-ANTIFERROMAGNET
SYSTEM SRCU2(BO3)(2)
PHASE-TRANSITION
GAP
FLUCTUATIONS
EXCITATIONS
LATTICE
Кл.слова (ненормированные):
Antiferromagnetic materials -- Magnetic fields -- Magnetization -- Phase diagrams -- Spectrum analysis -- Thermodynamics -- Analogous systems -- Square lattices -- Thermodynamic quantities -- Two-layer triangular antiferromagnets -- Quantum theory
Аннотация: The possibility of implementing a quantum-spin-liquid-type state in a two-layer triangular spin-1/2 antiferromagnet at T = 0 is investigated. The ratio of intra- to interlayer exchange constants (j) is found under which a transition from the classical state with 120 degrees triangular order to a quantum state with zero magnetization per site occurs; in this case, the spins of adjacent layers form singlets that are separated from triplet excitations by an energy gap. Compared with an analogous system with the square lattice, the range of j in which the classical ordered state is realized turns out to be an order of magnitude smaller due to the effects of frustration; in this case, the behavior of thermodynamic quantities is analogous, on the whole, to that in two-layer square lattices; a difference manifests itself in the behavior of the gap in the spectrum of quasiparticles in an external magnetic field h. For small fields h, a j-h phase diagram is constructed that determines the domains in which the 120 degrees and the singlet phases exist. It is established that, in the neighborhood of the second-order phase transition, the contribution, to the thermodynamic quantities, of longitudinal spin fluctuations, which are disregarded in the spin-wave description, is comparable to the contribution of transverse fluctuations. (c) 2005 Pleiades Publishing, Inc.
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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, Akademgorodok, 660036, Russian Federation
Доп.точки доступа:
Bondarenko, I. N.