/ S. N. Martynov // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism. [[b]]EASTMAG – 2013[[/b]] : abstracts. - Vladivostok : FEFU, 2013. - P117
. - ISBN 978-5-7444-3124-2
Доп.точки доступа:
Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
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Найдено документов в текущей БД: 48
Incommensurate magnetic structures in the rhombohedrally distorted cubiclattice
/ S. N. Martynov // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism : abstracts. - Vladivostok : FEFU, 2013. - P162
. - ISBN 978-5-7444-3124-2
Доп.точки доступа:
Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
Доп.точки доступа:
Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
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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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
Несоизмеримые структуры в двухподсистемном частично фрустрированном ферримагнетике
/ С. Н. Мартынов // Письма в Журн. эксперим. и теор. физ. - 2012. - Т. 95, Вып. 4. - С. 205-209. - Библиогр.: 23 назв. - Работа выполнена приподдержки РФФИ (грант № 10-02-00765)
. - ISSN 0370-274X
Аннотация: Для двухподсистемного магнетика с фрустрированным межподсистемным обменом и конкуренцией между обменами в одной из подсистем предложена новая несоизмеримая магнитная структура с локально треугольной ориентацией спинов. Структура возникает при понижении температуры из антиферромагнитного (АФ) состояния путем фазового перехода первого рода. При выполнении пороговых условий на обменные взаимодействия она переходит в треугольную структуру Яфета–Киттеля (ЯК). Увеличение протяженности фрустрированных обменных связей приводит к появлению между соизмеримыми АФ- и ЯК-фазами несоизмеримой фазы с локальной АФ-ориентацией подрешеток в каждой подсистеме.
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Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Martynov S. N.
Аннотация: Для двухподсистемного магнетика с фрустрированным межподсистемным обменом и конкуренцией между обменами в одной из подсистем предложена новая несоизмеримая магнитная структура с локально треугольной ориентацией спинов. Структура возникает при понижении температуры из антиферромагнитного (АФ) состояния путем фазового перехода первого рода. При выполнении пороговых условий на обменные взаимодействия она переходит в треугольную структуру Яфета–Киттеля (ЯК). Увеличение протяженности фрустрированных обменных связей приводит к появлению между соизмеримыми АФ- и ЯК-фазами несоизмеримой фазы с локальной АФ-ориентацией подрешеток в каждой подсистеме.
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Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Martynov S. N.
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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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
Incommensurate magnetic structures in the rhombohedrally distorted cubic lattice
/ S. N. Martynov // Solid State Phenom. : Selected, peer reviewed papers. - 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P. 61-65, DOI 10.4028/www.scientific.net/SSP.215.61. - Cited References: 8
. - ISSN 978-30383. - ISSN 1662-9779
Кл.слова (ненормированные):
Frustration of exchange interactions -- Incommensurate magnetic structures
Аннотация: The ground state of a rhombohedrally distorted magnetic cubic lattice with frustrated exchange in the thriangular base plane of spins and competition of exchanges between the nearest and next nearest planes was investigated. The dependence of helix vector components on the exchange parameters was calculated. The phase diagram of ground state was obtained. © (2014) Trans Tech Publications, Switzerland.
Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
Кл.слова (ненормированные):
Frustration of exchange interactions -- Incommensurate magnetic structures
Аннотация: The ground state of a rhombohedrally distorted magnetic cubic lattice with frustrated exchange in the thriangular base plane of spins and competition of exchanges between the nearest and next nearest planes was investigated. The dependence of helix vector components on the exchange parameters was calculated. The phase diagram of ground state was obtained. © (2014) Trans Tech Publications, Switzerland.
Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
Partially disordered state in the frustrated Heisenberg ferrimagnet
/ S. N. Martynov // Solid State Phenom. : Selected, peer reviewed papers. - 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P. 55-60, DOI 10.4028/www.scientific.net/SSP.215.55. - Cited References: 9
. - ISSN 978-30383. - ISSN 1662-9779
Кл.слова (ненормированные):
Ferrimagnet -- Frustration -- Partially disordered state -- Phase transitions
Аннотация: A model for the description of two-subsystem Heisenberg ferrimagnet with frustrated intersubsystem exchange and competition between exchange interactions in a subsystem is proposed. The conditions of the existence of noncollinear Yafet-Kittel state and partially ordered magnetic structure are investigated. The phase diagram of competition parameter vs temperature is obtained in the mean field approximation. The peculiarities of the succesive magnetic phase transitions are considered. © (2014) Trans Tech Publications, Switzerland.
Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
Кл.слова (ненормированные):
Ferrimagnet -- Frustration -- Partially disordered state -- Phase transitions
Аннотация: A model for the description of two-subsystem Heisenberg ferrimagnet with frustrated intersubsystem exchange and competition between exchange interactions in a subsystem is proposed. The conditions of the existence of noncollinear Yafet-Kittel state and partially ordered magnetic structure are investigated. The phase diagram of competition parameter vs temperature is obtained in the mean field approximation. The peculiarities of the succesive magnetic phase transitions are considered. © (2014) Trans Tech Publications, Switzerland.
Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
Симметричные конические несоизмеримые структуры фрустрированного изотропного гейзенберговского ферримагнетика
/ С. Н. Мартынов // Письма в Журн. эксперим. и теор. физ. - 2015. - Т. 102, Вып. 2. - С. 111-116, DOI 10.7868/S0370274X15140076. - Библиогр.: 16
. - ISSN 0370-274X
Аннотация: Для ферримагнетика с геометрически фрустрированным обменом между спинами в разных магнитных позициях (подсистемах) и конкуренцией между обменами в одной из подсистем аналитически исследованы условия возникновения конических несоизмеримых структур и определены температуры фазовых переходов в конические состояния. Численной минимизацией свободной энергии определены типы фазовых переходов и получены фазовые диаграммы температура - обменные параметры.
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Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Martynov, S. N.
Аннотация: Для ферримагнетика с геометрически фрустрированным обменом между спинами в разных магнитных позициях (подсистемах) и конкуренцией между обменами в одной из подсистем аналитически исследованы условия возникновения конических несоизмеримых структур и определены температуры фазовых переходов в конические состояния. Численной минимизацией свободной энергии определены типы фазовых переходов и получены фазовые диаграммы температура - обменные параметры.
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Институт физики им. Л.В. Киренского СО РАН
Доп.точки доступа:
Martynov, S. N.
Symmetrical conical incommensurate structures of a frustrated isotropic Heisenberg ferrimagnet
/ S. N. Martynov // JETP Letters. - 2015. - Vol. 102, Is. 2. - P. 100-104, DOI 10.1134/S0021364015140076. - Cited References:16
. - ISSN 0021. - ISSN 1090-6487. -
РУБ Physics, Multidisciplinary
Аннотация: The conditions of the appearance of conical incommensurate structures have been studied analytically for a ferrimagnet with the geometrically frustrated exchange between spins in different magnetic positions (subsystems) and the competition between exchanges in one of the subsystems. The phase transition temperatures to the conical states have been determined. The types of phase transitions have been determined by the numerical minimization of the free energy and (temperature-exchange parameters) phase diagrams have been obtained.
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Мартынов, Сергей Николаевич
Аннотация: The conditions of the appearance of conical incommensurate structures have been studied analytically for a ferrimagnet with the geometrically frustrated exchange between spins in different magnetic positions (subsystems) and the competition between exchanges in one of the subsystems. The phase transition temperatures to the conical states have been determined. The types of phase transitions have been determined by the numerical minimization of the free energy and (temperature-exchange parameters) phase diagrams have been obtained.
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Мартынов, Сергей Николаевич
Flat and conical incommensurate magnetic structures in the two-subsystem partially frustrated Heisenberg ferrimagnet
/ S. N. Martynov // J. Magn. Magn. Mater. - 2016. - Vol. 398. - P. 121-126, DOI 10.1016/j.jmmm.2015.09.046. - Cited References: 21
. - ISSN 0304-8853
РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Аннотация: The phase transitions into flat and conical incommensurate magnetic structures are considered for a ferrimagnet with the dominant nonfrustrated exchange between the spins in one crystallographic position, competing exchanges between the spins in another position and frustrated exchange between the spins in different positions. The appearance conditions and the temperatures of the second order phase transitions are analytically obtained in the mean field approximation. The first order phase transition between these states is studied and the phase diagrams of temperature vs frustrated exchanges are calculated by the numerical minimization of free energy.
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Мартынов, Сергей Николаевич
Рубрики:
Spin-wave spectrum
Phase 10 K
Copper metaborate
Classical-theory
State
Кл.слова (ненормированные):
Incommensurate magnetic structures -- Phase transitions -- Ferrimagnets
Spin-wave spectrum
Phase 10 K
Copper metaborate
Classical-theory
State
Кл.слова (ненормированные):
Incommensurate magnetic structures -- Phase transitions -- Ferrimagnets
Аннотация: The phase transitions into flat and conical incommensurate magnetic structures are considered for a ferrimagnet with the dominant nonfrustrated exchange between the spins in one crystallographic position, competing exchanges between the spins in another position and frustrated exchange between the spins in different positions. The appearance conditions and the temperatures of the second order phase transitions are analytically obtained in the mean field approximation. The first order phase transition between these states is studied and the phase diagrams of temperature vs frustrated exchanges are calculated by the numerical minimization of free energy.
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Мартынов, Сергей Николаевич
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
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
Transition between incommensurate phases accompanied by reversal of the magnetic structure vector in CuB2O4
/ S. N. Martynov // Phys. Solid State. - 2005. - Vol. 47, Is. 4. - P. 678-683, DOI 10.1134/1.1913980. - Cited References: 17
. - ISSN 1063-7834
РУБ Physics, Condensed Matter
Аннотация: The incommensurate magnetic state of copper metaborate CuB2O4 is studied in the temperature range 2 T 12 K. Competition between frustrated and non-frustrated antisymmetric exchange interactions is shown to cause the magnetic structure vector to reverse at T
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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Мартынов, Сергей Николаевич
Аннотация: The incommensurate magnetic state of copper metaborate CuB2O4 is studied in the temperature range 2 T 12 K. Competition between frustrated and non-frustrated antisymmetric exchange interactions is shown to cause the magnetic structure vector to reverse at T
WOS,
Scopus,
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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Мартынов, Сергей Николаевич
Anharmonic states of the one-dimensional anisotropic Heisenberg model with free boundary conditions
/ S. N. Martynov // Theor. Math. Phys. - 1998. - Vol. 117, Is. 3. - P. 1499-1506, DOI 10.1007/BF02557187. - Cited References: 6
. - ISSN 0040-5779
РУБ Physics, Multidisciplinary + Physics, Mathematical
Аннотация: States described by anharmonic functions are shown to exist in the one-dimensional anisotropic Heisenberg model with a finite number of spins 1/2 and free boundary conditions. Several such, states are determined.
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Держатели документа:
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk, Russia
ИФ СО РАН
Доп.точки доступа:
Мартынов, Сергей Николаевич
Рубрики:
STRING HYPOTHESIS
STRING HYPOTHESIS
Аннотация: States described by anharmonic functions are shown to exist in the one-dimensional anisotropic Heisenberg model with a finite number of spins 1/2 and free boundary conditions. Several such, states are determined.
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Держатели документа:
Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk, Russia
ИФ СО РАН
Доп.точки доступа:
Мартынов, Сергей Николаевич
Two-magnon states in the one-dimensional isotropic Heisenberg model with free boundary conditions
/ S. N. Martynov // Theor. Math. Phys. - 1997. - Vol. 113, Is. 2. - P. 1484-1490, DOI 10.1007/BF02634174. - Cited References: 7
. - ISSN 0040-5779
РУБ Physics, Multidisciplinary + Physics, Mathematical
Аннотация: The eigenfunctions and eigenvalues of the energy of two-magnon states in the finite one-dimensional isotropic Heisenberg model S = 1/2 with free boundary conditions were found by solving the Schrodinger equation. The obtained solutions are single-parametric in contrast to two-parametric solutions in the model with cyclic boundary conditions. The amplitudes of the wave functions of coupled two-magnon states exponentially depend on both the distance between the flipped spins and the coordinate of the center of the complex. This leads to a localization of low energy complexes at the ends of the ferromagnetic chain.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk, Russia
ИФ СО РАН
Доп.точки доступа:
Мартынов, Сергей Николаевич
Рубрики:
STRING HYPOTHESIS
STRING HYPOTHESIS
Аннотация: The eigenfunctions and eigenvalues of the energy of two-magnon states in the finite one-dimensional isotropic Heisenberg model S = 1/2 with free boundary conditions were found by solving the Schrodinger equation. The obtained solutions are single-parametric in contrast to two-parametric solutions in the model with cyclic boundary conditions. The amplitudes of the wave functions of coupled two-magnon states exponentially depend on both the distance between the flipped spins and the coordinate of the center of the complex. This leads to a localization of low energy complexes at the ends of the ferromagnetic chain.
WOS,
Scopus
Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk, Russia
ИФ СО РАН
Доп.точки доступа:
Мартынов, Сергей Николаевич
Single-ion-anisotropy of exchange-coupled Mn-2+ ions in (CH3)4NCDCl3 and CSCDCl3
/ S. N. Martynov, S. B. PETROV // Phys. Status Solidi B. - 1988. - Vol. 149, Is. 1. - P. K41-K44, DOI 10.1002/pssb.2221490151. - Cited References: 11
. - ISSN 0370-1972
РУБ Physics, Condensed Matter
WOS
Доп.точки доступа:
PETROV, S. B.; Мартынов, Сергей Николаевич
WOS
Доп.точки доступа:
PETROV, S. B.; Мартынов, Сергей Николаевич
Single-ion-anisotropy and electron-spin-resonance linewidth in quasi-low-dimensional heisenberg magnets
/ S. N. Martynov // Phys. Status Solidi B. - 1988. - Vol. 146, Is. 2. - P. 691-696, DOI 10.1002/pssb.2221460229. - Cited References: 18
. - ISSN 0370-1972
РУБ Physics, Condensed Matter
WOS
Доп.точки доступа:
Мартынов, Сергей Николаевич
WOS
Доп.точки доступа:
Мартынов, Сергей Николаевич
Exact two-magnon solutions of the one-dimensional isotropic Heisenberg model and string hypothesis
/ S. N. Martynov // Phys. Lett. A. - 1996. - Vol. 219, Is. 5-6. - P. 329-334, DOI 10.1016/0375-9601(96)00470-7. - Cited References: 5
. - ISSN 0375-9601
РУБ Physics, Multidisciplinary
Кл.слова (ненормированные):
Heisenberg model -- two-magnon states -- Bethe ansatz -- resonance absorption
Аннотация: By means of the exact solution of the Schrodinger equation the eigenfunctions and eigenvalues of the energy for two-magnon states in the one-dimensional isotropic Heisenberg spin chain of N spins-1/2 were found. It is shown that symmetrical and antisymmetrical complex solutions have different K-dependences of the energy. Exact values of the quasi-momentum for both branches are compared with a string hypothesis prediction and solutions of the Bethe ansatz equations. With the help of the obtained solutions it was shown that resonance absorption leads to a change in momentum of the existing magnon and excitation of the magnon whose momentum is different from the absorption momentum.
WOS
Доп.точки доступа:
Мартынов, Сергей Николаевич
Кл.слова (ненормированные):
Heisenberg model -- two-magnon states -- Bethe ansatz -- resonance absorption
Аннотация: By means of the exact solution of the Schrodinger equation the eigenfunctions and eigenvalues of the energy for two-magnon states in the one-dimensional isotropic Heisenberg spin chain of N spins-1/2 were found. It is shown that symmetrical and antisymmetrical complex solutions have different K-dependences of the energy. Exact values of the quasi-momentum for both branches are compared with a string hypothesis prediction and solutions of the Bethe ansatz equations. With the help of the obtained solutions it was shown that resonance absorption leads to a change in momentum of the existing magnon and excitation of the magnon whose momentum is different from the absorption momentum.
WOS
Доп.точки доступа:
Мартынов, Сергей Николаевич
The incommensurate magnetic structure of a tetragonal antiferromagnet with antisymmetric exchange
/ S. N. Martynov // J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 6. - P. 979-988, DOI 10.1134/S1063776109120097. - Cited References: 34
. - ISSN 1063-7761
РУБ Physics, Multidisciplinary
Аннотация: Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski-Moriya exchange interaction (the weakly ferromagnetic component of vector D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first time for a tetragonal antiferromagnet. The helicoidal component for each pair of interacting spins has a 2D distribution; its direction in the tetragonal plane depends on the direction of the exchange bond in each pair. The Lifshits invariant of the Ginzburg-Landau functional is obtained, which is responsible for the formation of an incommensurate magnetic structure for such a distribution. It is shown in the mean field approximation that the incommensurate magnetic structure that forms in this case is a nonlinear double helicoid with a modulation vector lying in the tetragonal plane and with a varying angle between the polarization planes of quasi-antiferromagnetic sublattices. The ground state of the magnet is degenerate in the orientation of the modulation vector in the tetragonal plane. The rate of variation in the orientations of moments in the polarization planes passing through the tetragonal axis is controlled by the angle between the directions of the moments and the tetragonal axis. The local weakly ferromagnetic moment remaining in the polarization plane varies in magnitude and sign. The relation between the orientations of the modulation and polarization vectors is derived for the cases of simple and inversion tetragonal axes in the space symmetry group of the crystal.
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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Мартынов, Сергей Николаевич
Рубрики:
FLUCTUATION-INDUCED PHASE
FIELD-INDUCED GAP
COPPER METABORATE
WEAK FERROMAGNETISM
SOLITON LATTICE
SPIN-WAVES
CUB2O4
BA2CUGE2O7
CSCUCL3
CHAINS
Кл.слова (ненормированные):
Anti-symmetric -- Antiferromagnetic sublattices -- Antiferromagnets -- Antisymmetric exchange -- Exchange bonds -- Ferromagnetic component -- Ferromagnetic moments -- Ginzburg-Landau functional -- Incommensurate magnetic structures -- Mean field approximation -- Modulation vectors -- Polarization planes -- Polarization vectors -- Symmetry groups -- Antiferromagnetic materials -- Antiferromagnetism -- Crystal orientation -- Crystal symmetry -- Ferromagnetic materials -- Ferromagnetism -- Magnetic devices -- Magnetic structure -- Modulation -- Polarization -- Vector spaces -- Vectors -- Crystallography
FLUCTUATION-INDUCED PHASE
FIELD-INDUCED GAP
COPPER METABORATE
WEAK FERROMAGNETISM
SOLITON LATTICE
SPIN-WAVES
CUB2O4
BA2CUGE2O7
CSCUCL3
CHAINS
Кл.слова (ненормированные):
Anti-symmetric -- Antiferromagnetic sublattices -- Antiferromagnets -- Antisymmetric exchange -- Exchange bonds -- Ferromagnetic component -- Ferromagnetic moments -- Ginzburg-Landau functional -- Incommensurate magnetic structures -- Mean field approximation -- Modulation vectors -- Polarization planes -- Polarization vectors -- Symmetry groups -- Antiferromagnetic materials -- Antiferromagnetism -- Crystal orientation -- Crystal symmetry -- Ferromagnetic materials -- Ferromagnetism -- Magnetic devices -- Magnetic structure -- Modulation -- Polarization -- Vector spaces -- Vectors -- Crystallography
Аннотация: Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski-Moriya exchange interaction (the weakly ferromagnetic component of vector D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first time for a tetragonal antiferromagnet. The helicoidal component for each pair of interacting spins has a 2D distribution; its direction in the tetragonal plane depends on the direction of the exchange bond in each pair. The Lifshits invariant of the Ginzburg-Landau functional is obtained, which is responsible for the formation of an incommensurate magnetic structure for such a distribution. It is shown in the mean field approximation that the incommensurate magnetic structure that forms in this case is a nonlinear double helicoid with a modulation vector lying in the tetragonal plane and with a varying angle between the polarization planes of quasi-antiferromagnetic sublattices. The ground state of the magnet is degenerate in the orientation of the modulation vector in the tetragonal plane. The rate of variation in the orientations of moments in the polarization planes passing through the tetragonal axis is controlled by the angle between the directions of the moments and the tetragonal axis. The local weakly ferromagnetic moment remaining in the polarization plane varies in magnitude and sign. The relation between the orientations of the modulation and polarization vectors is derived for the cases of simple and inversion tetragonal axes in the space symmetry group of the crystal.
WOS,
Scopus,
Для получение полного текста обратитесь в библиотеку
Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Мартынов, Сергей Николаевич