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ZAMKOVA, N. G.
THERMODYNAMICS OF THE 2-DIMENSIONAL SUPEREXCHANGE MODEL OF MITSUI / N. G. ZAMKOVA, V. I. ZINENKO // Theor. Math. Phys. - 1989. - Vol. 79, Is. 2. - P. 530-536, DOI 10.1007/BF01016535. - Cited References: 14 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical

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Доп.точки доступа:
ZINENKO, V. I.; Зиненко, Виктор Иванович; Замкова, Наталья Геннадьевна
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Bayukov, O. A.
Application of the superexchange model to the evaluation method of exchange and 3d-electron transfer parameters in magnetodielectrics / O. A. Bayukov, A. F. Savitskii // Phys. Status Solidi B. - 1989. - Vol. 152, Is. 2. - P. K51-K53, DOI 10.1002/pssb.2221520236. - Cited References: 6 . - ISSN 0370-1972

РУБ Physics, Condensed Matter

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Доп.точки доступа:
Savitskii, A. F.; Баюков, Олег Артемьевич
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KRUSTALEV, B. P.
EXCHANGE INTERACTIONS IN SUPERPARAMAGNETIC NANOCLUSTER FILMS FE-SIO / B. P. KRUSTALEV, A. D. BALAEV, V. M. SOSNIN // Solid State Commun. - 1995. - Vol. 95, Is. 5. - P. 271-275, DOI 10.1016/0038-1098(95)00264-2. - Cited References: 9 . - ISSN 0038-1098

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
NANOSTRUCTURES -- THIN FILMS -- EXCHANGE AND SUPEREXCHANGE
Аннотация: The magnetic properties of superparamagnetic films Fe-SiO have been investigated. It has been shown that a proper consideration of intra- and intercluster interactions describes well the magnetic behavior of the films. Their main parameters have been determined. On the basis of a proposed cluster model, the decrease of the effective magnetic moment per one iron atom is explained.

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Доп.точки доступа:
BALAEV, A. D.; Балаев, Александр Дмитриевич; SOSNIN, V. M.; Соснин, Виктор Михайлович
}
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    The superexchange interactions in mixed Co-Fe ludwigite / N. V. Kazak [et al.] // J. Magn. Magn. Mater. - 2011. - Vol. 323, Is. 5. - P. 521-527, DOI 10.1016/j.jmmm.2010.09.057. - Cited Reference Count: 15. - Гранты: This study was supported by the Russian Foundation for Basic Research (Project no. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (Project no. MK-5632. 2010.2), Physical Division of the Russian Academy of Science, the program "Strongly Correlated Electrons", project 2.3.1.; The financial support of Spanish MINCYT, MAT08/1077 and Aragonese E-34 project are also acknowledged. - Финансирующая организация: Russian Foundation for Basic Research [09-02-00171-a]; Federal Agency for Science and Innovation (Rosnauka) [MK-5632. 2010.2]; Physical Division of the Russian Academy of Science; "Strongly Correlated Electrons" [2.3.1]; Spanish MINCYT [MAT08/1077]; Aragonese E-34 project . - MAR. - ISSN 0304-8853
Рубрики:
TRANSPORT-PROPERTIES
   SPECTRA
Кл.слова (ненормированные):
ludwigite structure -- magnetic susceptibility -- magnetic frustration -- mott conductivity -- ludwigite structure -- magnetic frustration -- magnetic susceptibility -- mott conductivity -- ac susceptibility -- cation distributions -- crystal data -- crystallographic sites -- electrical resistivity -- iron atoms -- low temperatures -- ludwigite structure -- magnetic behavior -- magnetic frustrations -- magnetic system -- magnetic transitions -- mossbauer -- mossbauer effects -- mott conductivity -- mott hopping -- superexchange energy -- superexchange interaction -- temperature regions -- trivalent iron -- variable range -- cobalt -- electric conductivity -- magnetic susceptibility -- magnetism -- mossbauer spectroscopy -- x ray diffraction -- crystal structure
Аннотация: The crystal structure, cation distribution and exchange interactions in the Co2.25Fe0.75O2BO3 ludwigite have been explored through X-ray diffraction, electrical resistivity, ac-susceptibility and Mossbauer effect measurements. The crystal data have shown that iron atoms occupy the most symmetric crystallographic sites Fe4 and Fe2. The complex magnetic behavior with two magnetic transitions near 70 and 115 K at low temperatures was found. The Mossbauer data have displayed the trivalent iron states only. The values of superexchange energies have been estimated for Co3O2BO3 and Co2.25Fe0.75O2BO3 yielding a significant role of frustrations in the ludwigite magnetic system. Variable range Mott hopping conductivity law was proved to be valid in the wide temperature region, pointing out a localized character of charge carriers rather than collective. (C) 2010 Elsevier B.V. All rights reserved.

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Держатели документа:
RAS, LV Kirensky Phys Inst, SB, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Abd Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
Univ Zaragoza, Area Medidas Fis, Serv Instrumentac Cient, E-50009 Zaragoza, Spain

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Bayukov, O. A.; Баюков, Олег Артемьевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Rudenko, V. V.; Руденко, Валерий Васильевич; Ivanova, N. B.; Иванова, Наталья Борисовна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bartolom, J.; Arauzo, A.
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Val'kov, V. V.
Effect of pressure on antiferromagnetic and superconducting ordering in systems with heavy fermions / V. V. Val'kov, A. O. Zlotnikov // Bull. Russ. Acad. Sci.: Phys. - 2012. - Vol. 76, Is. 7. - P. 733-736, DOI 10.3103/S1062873812070362. - Cited References: 7. - This work was supported by the Department of Physical Sciences, Russian Academy of Sciences (the Strong Electron Correlations Program); the Russian Foundation for Basic Research, projects nos. 100200251 and 110200741; the RFBR Sibir’, project no. 110298007; and by the federal target program Scientific and Pedagogical Personnel of an Innovative Russia, 2009–2013. . - ISSN 0022-2860
Кл.слова (ненормированные):
Antiferromagnetic orderings -- Antiferromagnetic orders -- Antiferromagnetic phasis -- Antiferromagnetics -- Cooper instability -- Effect of pressure -- External pressures -- Heavy fermion -- Impurity level -- Localized state -- Periodic Anderson model -- Seed energy -- Spin moments -- Superconducting ordering -- Superexchange interaction -- Superconductivity -- Antiferromagnetism
Аннотация: Characteristics of the superconducting and antiferromagnetic phases of heavy-fermion intermet-allides are described within a periodic Anderson model with allowance for the superexchange interaction between spin moments of the localized states. It is shown that an external pressure that changes the seed energy of an impurity level can rapidly destroy the long-range antiferromagnetic order. The development of the Cooper instability near such an order-disorder transition induces the experimentally observed state in which superconductivity coexists with the antiferromagnetic ordering. В© 2012 Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Влияние давления на антиферромагнитное и сверхпроводящее упорядочение в системах с тяжелыми фермионами [Текст] / В. В. Вальков, A. O. Злотников // Изв. РАН. Сер. физич. - 2012. - Т. 76 № 7. - С. 821-824

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; International Interdisciplinary Symposium “Ordering in Minerals and Alloys” (14th ; 8 -13 Sept. 2011 ; Rostov-on-Don)
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Magnetic structure of CoFeBO4 warwickite in terms of superexchange [Текст] / Yu. V. Knyazev [и др.] // Moscow Int. Symp. on Magnet. (MISM-2014) : Book of abstracts. - 2014. - Ст. 1PO-I1-12. - P. 447 . - ISBN 978-5-91978-025-0

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Доп.точки доступа:
Knyazev, Yu.V.; Князев, Юрий Владимирович; Bayukov, O. A.; Баюков, Олег Артемьевич; Ivanova, N. B.; Иванова, Наталья Борисовна; Kazak, N. V.; Казак, Наталья Валерьевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Platunov, M. S.; Платунов, Михаил Сергеевич; Arauzo, A.; Араузо А.; Bartolomé, J.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Moscow International Symposium on Magnetism(6 ; 2014 ; 29 June-3 July ; Moscow); Московский государственный университет им. М.В. Ломоносова
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Role of superexchange interactions in the ferromagnetism of manganites / I. O. Troyanchuk [et al.] // J. Exp. Theor. Phys. - 2015. - Vol. 120, Is. 1. - P. 97-102, DOI 10.1134/S1063776115010173. - Cited References:25. - This work was supported by the Belarussian Foundation for Basic Research, project no. F12SO-026. . - ISSN 1063. - ISSN 1090-6509. -

РУБ Physics, Multidisciplinary
Рубрики:
PHASE
NMR
Аннотация: Compound La0.7Sr0.3Mn0.85Nb0.15O3, in which manganese ions are in an oxidation state close to 3+, are studied by neutron diffraction and magnetic measurements. This compound is shown to be a ferromagnet with T C = 145 K and a magnetic moment of 3.1 μB/Mn at T = 10 K. No signs of cooperative orbital ordering are detected. When Mg2+ ions substitute for some Nb5+ ions, Mn4+ ions appear but ferromagnetism is not enhanced. An increase in the structural distortions leads to a decrease in the ferromagnetic component. The ferromagnetic state is assumed to be caused by substantial hybridization of the e g orbitals of manganese and oxygen, which increases the positive part of the superexchange interactions.

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Публикация на русском языке Роль сверхобменных взаимодействий в ферромагнетизме манганитов [Текст] / И. О. Троянчук [и др.] // Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 147 Вып. 1. - С. 112-118

Держатели документа:
Natl Acad Sci Belarus, Sci & Pract Mat Res Ctr, Minsk 220072, Byelarus.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Helmholtz Ctr Berlin, D-14109 Berlin, Germany.
Joint Inst Nucl Res, Dubna 141980, Moscow Oblast, Russia.
Inst Laue Langevin, F-38042 Grenoble 9, France.

Доп.точки доступа:
Troyanchuk, I. O.; Bushinsky, M. V.; Volkov, N. V.; Волков, Никита Валентинович; Sikolenko, V.; Efimova, E. A.; Ritter, C.
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Ferromagnetism in single-valent manganites / I. O. Troyanchuk [et al.] // J. Alloys Compd. - 2015. - Vol. 619. - P. 719-725, DOI 10.1016/j.jallcom.2014.08.236. - Cited References: 46. - The authors would like to thank J.B. Goodenough for the fruitful discussion. This work has been supported by Belarusian Republican Foundation for Fundamental Research (Grant F14R-040). . - ISSN 0925-8388. - ISSN 1873-4669

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
PHASE-SEPARATION
   DOPED MANGANITES
   DOUBLE EXCHANGE
   DIFFRACTION
   OXIDES
   NMR
Кл.слова (ненормированные):
Magnetically ordered materials -- Solid state reactions -- Exchange and superexchange -- Magnetic measurements -- Neutron diffraction
Аннотация: Structural and magnetization measurements have been performed on the La0.7Sr0.3Mn0.85 Nb 0.15 - x 5 + Mg x 2 + O3 stoichiometric compounds. With rise of the Mg2+ content the formal oxidation state manganese increases from +3 ( x = 0 ) up to +3.55 ( x = 0.15 ) . The compositions with 0 ⩽ x ≤ 0.08 undergo a structural transition from rhombohedral to orthorhombic symmetry below room temperature whereas x = 0.1 and x = 0.15 compounds are rhombohedral down to 2 K. The structural parameters evidence that the orthorhombic phase is not long-range orbitally ordered and that the structural transition is associated with a steric effect. The Mg-free compound is ferromagnetic with the Curie point of around 150 K and a magnetic moment of 3.1 μ B /Mn. The substitution of Nb5+ with Mg2+ leads to a gradual weakening of the ferromagnetic component while in the x = 0.15 compound A-type antiferromagnetic short-range order is stabilized in spite of macroscopic R 3 ¯ c symmetry. All the compositions show insulating behavior. It is suggested that ferromagnetism is originated from superexchange interactions via oxygen. Covalence enhances the positive part of the superexchange interactions whereas structural disorder induced by Nb5+ and Mg2+ ions leads to suppression of ferromagnetism.

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Держатели документа:
Sci Pract Mat Res Ctr NAS Belarus, Minsk 220072, Byelarus
Helmholtz Zentrum Berlin, D-14109 Berlin, Germany
Joint Inst Nucl Res, Dubna 141980, Russia
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France
ISMRA Univ Caen, UMR Associee CNRS 6508, Lab CRISMAT, F-14050 Caen, France
Univ Caen, F-14050 Caen, France

Доп.точки доступа:
Troyanchuk, I. O.; Bushinsky, M. V.; Sikolenko, V.; Efimov, V.; Volkov, N. V.; Волков, Никита Валентинович; Tobbens, D. M.; Ritter, C.; Raveau, B.
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Pressure effect on the energy structure and superexchange interaction in undoped orthorhombic La2CuO4 / V. A. Gavrichkov [et al.] // Int. J. Mod. Phys. B. - 2016. - Vol. 30, Is. 25, DOI 10.1142/S0217979216501800 . - ISSN 0217-9792
Кл.слова (ненормированные):
antiferromagnetic La214 -- pressure -- Superexchange interaction
Аннотация: We studied the pressure dependences of the electronic structure and superexchange interaction J(P)=JA−JB (where JA and JB are antiferromagnetic (AFM) and ferromagnetic (FM) contributions) in antiferromagnetic La214 under hydrostatic, uniaxial (along c-axial) 3% compressions and 1% in-plane compressions by the local density approximation with generalized tight-binding method (LDA + GTB cell approach). The changes in J(P) correlated with the experimentally known TC(P) dependence are in accordance with the relation dTC/dP=(∂TC/∂J)(∂J/∂P), where ∂TC/∂J∼0.1. The in-plane pressure more effectively stabilizes the ground singlet two-hole state A1 than the simple hydrostatic pressure, its effect on J and TC is the largest. Within the same cell approach together with the superexchange interaction J(P), the valence band structure was calculated. Its changes with pressure clearly reproduce the k-distribution of the singlet and triplet quasi-particles over the Brillouin zone (BZ).

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Держатели документа:
L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation
M. N. Miheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian Federation
Department of Theoretical Physics and Applied Mathematics, Ural Federal University, 19 Mira St., Ekaterinburg, Russian Federation
Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian Federation

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Pchelkina, Z. V.; Nekrasov, I. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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10.

Polukeev, S. I.
In-gap excitation effect on a superexchange in La2CuO4 by creating a nonequilibrium photoexcited centers / S. I. Polukeev, V. A. Gavrichkov, S. G. Ovchinnikov // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P1.30. - P. 90-91. - References: 10. - This work was supported by RFBR Grant 16-02-00273 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
superexchange -- Mott-Hubbard materials -- light pumping -- La214

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Полукеев, Семен Игоревич; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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11.

    The superexchange interactions and magnetic ordering in low-dimentional ludwigite Ni5GeB2O10 / S. N. Sofronova [et al.] // J. Magn. Magn. Mater. - 2016. - Vol. 401. - P. 217-222, DOI 10.1016/j.jmmm.2015.10.024. - Cited References: 23. - This study was supported by Russian Foundation for Basic Research (RFFI Siberia No. 15-42-04186). We thank S. Popkov, G. Yurkin for help on the magnetic measurements and M.S. Molokeev for help on the x-ray diffraction . - ISSN 0304-8853
   Перевод заглавия: Суперобменные взаимодействия и магнитное упорядочение в низкомерном людвигите Ni5GeB2O10

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
DIELECTRICS
EXCHANGE
CATION
Кл.слова (ненормированные):
Ludwigites -- Magnetic order -- Heat capacity -- Exchange interactions -- Ferrimagnetic
Аннотация: The ludwigite Ni5Ge(BO5)2 belongs to a family of oxyborates which have low-dimensional subunits in the form of three-leg ladders unit structure. This material was studied by magnetic and thermodynamic measurements. Ni5Ge(BO5)2 does not show full long-range magnetic order, but one goes into a partial ordering or spin-glass state at 87 K. The superexchange interactions were calculated in the framework of a simple indirect coupling model. Different models of magnetic structure of Ni5Ge(BO5)2 and its unique magnetic behaviour was discussed. © 2015 Elsevier B.V.

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation
M.V. Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremin, E. V.; Еремин, Евгений Владимирович; Nazarenko, I. I.; Назаренко, Илья Иванович; Volkov, N. V.; Волков, Никита Валентинович; Kartashev, A. V.; Карташев, Андрей Васильевич; Moshkina, E. M.; Мошкина, Евгения Михайловна
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12.

Crystal growth, structure, magnetic properties and theoretical exchange interaction calculations of Cu2MnBO5 / S. Sofronova [et al.] // J. Magn. Magn. Mater. - 2016. - Vol. 420. - P. 309-316, DOI 10.1016/j.jmmm.2016.07.019. - Cited References: 35. - X-ray diffraction experiment was carried out at the Centre on Molecular Design and Ecologically Safe Technologies at the Novosibirsk State University. The reported study was funded by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028. . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPIN-GLASS BEHAVIOR
   SINGLE-CRYSTALS
   SUPEREXCHANGE INTERACTIONS
   LUDWIGITE
   DIELECTRICS
   CO3B2O6NI3B2O6
   WARWICKITES
   FE3O2BO3
   IFEFFIT
   NI3B2O6
Кл.слова (ненормированные):
Oxyborates -- Ludwigites -- XMCD -- EXAFS -- Magnetism
Аннотация: Single crystals of ludwigite Cu2MnBO5 were synthesized by flux growth technique. The detailed structural and magnetic characterizations of the synthesized samples have been carried out. The cations composition of the studied crystal was determined using X-ray diffraction and EXAFS technique, the resulting composition differ from the content of the initial Mn2O3–CuO components of the flux. Magnetic susceptibility measurements and the calculations of the exchange integrals in frameworks of indirect coupling model revealed that monoclinic distortions strongly affect exchange interactions and appearance of magnetic ordering phase at the temperature T=93 K. The hypothesis of the existence of several magnetic subsystems was supposed. © 2016 Elsevier B.V.

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation
M V Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS, Novosibirsk, Russian Federation
Novosibirsk State University, Novosibirsk, Russian Federation
Institute of Physics, University of Mainz, Mainz, Germany
Institute of Inorganic and Analytical Chemistry, University of Mainz, Mainz, Germany
Lund University, MAX IV Laboratory, Lund, Sweden
National Research Centre “Kurchatov Institute”, Moscow, Russian Federation

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Moshkina, E. M.; Мошкина, Евгения Михайловна; Nazarenko, I. I.; Назаренко, Илья Иванович; Seryotkin, Yu. V.; Nepijko, S. A.; Ksenofontov, V.; Medjanik, K.; Veligzhanin, A. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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13.

Gavrichkov, V. A.
Contribution from optically excited many-electron states to the superexchange interaction in Mott-Hubbard insulators / V. A. Gavrichkov, S. I. Polukeev, S. G. Ovchinnikov // Phys. Rev. B. - 2017. - Vol. 95, Is. 14. - Ст. 144424, DOI 10.1103/PhysRevB.95.144424. - Cited References: 49. - This work was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Region Science and Technology Support Fund to the research Project No. 17-42-240212. We are also grateful to the RFBR Grants No. 16-02-00273, No. 16-02-00098, and No. NSh-7559.2016.2. . - ISSN 1098-0121
Аннотация: We investigated the effects of excited many-electron states in the optical control of the magnetic state in undoped Mott-Hubbard insulator. To derive the spin Hamiltonian in material under optical pumping one has used a many-electron approach based on the X-operator representation. Extending the projection operators approach on arbitrary energy spectra of the Mott-Hubbard insulator, we obtained the Hamiltonian of superexchange interaction in analytical form. The Hamiltonian includes the spin-exciton variables which are usually missing in discussion on the magnetic response to optical pumping. The superexchange is also not additive over contributions from the ground and optical excited states, and nonzero contributions to the Dzyaloshinskii-Moriya interaction are induced in insulators with different spins at the ground and excited cell states. As a test, a microscopic background for the optical induced superexchange was analyzed in La2CuO4 (further La214) and FeBO3 with spins 1/2 and 5/2, respectively. © 2017 American Physical Society.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
National Research Nuclear University MEPHI, Moscow Engineering Physics Institute, Moscow, Russian Federation

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
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14.

Gavrichkov, V. A.
Superexchange interaction in magnetic insulators with spin crossover / V. A. Gavrichkov, S. I. Polukeev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 4. - P. 713-720, DOI 10.1134/S1063776118100023. - Cited References: 34. - This work was supported by the Russian Science Foundation (project no. 18-12-00022). . - ISSN 1063-7761
Кл.слова (ненормированные):
Antiferromagnetism -- Ground state -- High pressure engineering -- Ions -- Iron compounds -- Magnetic materials
Аннотация: We present the derivation of a microscopic superexchange Hamiltonian for undoped magnetic insulators with an arbitrary spin. It is established that the sign of the (ferromagnetic or antiferromagnetic) superexchange between magnetic ions in the dn configuration depends on the spin nature of virtual multielectron states dn± 1, viz., low-spin or high-spin partners with S ± 1/2 relative to ground state of the dn configuration with spin S. A macroscopic substantiation is given for the Goodenough–Kanamori rules and simple mean-field estimates connecting the magnetic ordering temperature with the exchange constant. The conventional Anderson superexchange for magnetic materials with spin S = 1/2 and the P/T magnetic phase diagram for ferroborate FeBO3 with spin crossover S = (5/2 ↔ 1/2) at the Fe3+ ion under a high pressure are also reproduced as a test.

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Публикация на русском языке Гавричков, Владимир Александрович. Суперобменное взаимодействие в магнитных диэлектриках со спиновым кроссовером [Текст] : статья / В. А. Гавричков, С. И. Полукеев, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2018. - Т. 154 Вып. 4. - С. 835-843

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
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15.

    Polukeev, S. I.
    Effects of optical intra-gap transitions on superexchange interaction in La2CuO4 with nonequilibrium photoexcited centers / S. I. Polukeev, V. A. Gavrichkov, S. G. Ovchinnikov // J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 2. - P. 159-170 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2018-11-2-159-170. - Cited References: 39 . - ISSN 1997-1397
   Перевод заглавия: Эффекты оптических внутрищелевых переходов в суперобменном взамодействии в La2CuO4 с неравновесными фотовозбуждёнными центрами
Кл.слова (ненормированные):
Superexchange -- Optically excited states -- Mott-Hubbard insulator -- суперобмен -- оптически возбужденные состояния -- диэлектрик Мотта-Хаббарда
Аннотация: We investigated the effects of excited many-electron states in the optical control of the magnetic state in undoped Mott-Hubbard insulator. To derive the spin Hamiltonian in material under optical pumping we have used many-electron approach based on the X-operator representation. Extending the projection operators approach on arbitrary energy spectra of the Mott-Hubbard insulator, we obtained the Hamiltonian of superexchange interaction in analytical form. The Hamiltonian includes the spin-exciton variables which are usually missing in discussion on the magnetic response to optical pumping, and is not additive over contributions from the ground and optically excited states. As a test, a microscopic background for the optical induced superexchange was analyzed in La2CuO4 (further La214).
Мы исcледовали эффекты возбужденных многоэлектронных состояний в оптическом способе управления магнитным состоянием недопированных Мотт-Хаббардовских материалов. Для вывода спинового гамильтониана в веществе под воздействием оптической накачки был использован многоэлектронный метод, основанный на представлении X-операторов. С помощью обобщенного на произвольный энергетический спектр метода проекционных операторов мы получили гамильтониан суперобменного взаимодействия в аналитической форме. Гамильтониан является не аддитивными по вкладам от основных и оптически возбуждённых состояний, а также содержит спин-экситонные переменные, которые обычно отсутствуют в обсуждении магнитного отклика на оптическую накачку. В качестве конкретного приложения для теории мы рассчитали индуцированный суперобмен для оптически возбужденного купрата La2CuO4 (в дальнейшем La214).

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50/38, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Svobodny, 79, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Полукеев, Семен Игоревич

}
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16.

Polukeev, S. I.
Dependence of superexchange interaction in CrO2 on pressure / S. I. Polukeev, V. A. Gavrichkov, S. G. Ovchinnikov // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст. H.P19. - P. 103. - Cited References: 3. - Support by RSF grant 18-12-00022 is acknowledged . - ISBN 978-5-9500855-7-4

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Полукеев, Семен Игоревич; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
Нет сведений об экземплярах (Источник в БД не найден)
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17.

    Gavrichkov, V. A.
    Cation spin and superexchange interaction in oxide materials below and above spin crossover under high pressure / V. A. Gavrichkov, S. I. Polukeev, S. G. Ovchinnikov. - Electronic text data // ArXiv. - 2019. - Ст. 1911.06482. - Cited References: 63. - We acknowledge the support of the Russian Science Foundation through Grant 18-12-00022.
Рубрики:
Materials Science
   Strongly Correlated Electrons
Аннотация: We derived simple rules for the sign of superexchange interaction based on the multielectron calculations of the superexchange interaction in the transition metal oxides that are valid both below and above spin crossover under high pressure. The superexchange interaction between two cations in dn configurations is given by a sum of individual contributions related to the electron-hole virtual excitations to the different states of the dn+1 and dn−1 configurations. Using these rules, we have analyzed the sign of the superexchange interaction of a number of oxides with magnetic cations in electron configurations from d2 till d8: the iron, cobalt, chromium, nickel, copper and manganese oxides with increasing pressure. The most interesting result concerns the magnetic state of cobalt and nickel oxides CoO, Ni2O3 and also La2CoO4, LaNiO3 isostructural to well-known high-TC and colossal magnetoresistance materials. These oxides have a spin 12 at the high pressure. Change of the interaction from antiferromagnetic below spin crossover to ferromagnetic above spin crossover is predicted for oxide materials with cations in d5(FeBO3) and d7(CoO) configurations, while for materials with the other dn configurations spin crossover under high pressure does not change the sign of the superexchange interaction.

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Держатели документа:
Kirensky Institute of Physics, Akademgorodok 50, bld.38, Krasnoyarsk, 660036 Russia

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович
}
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18.

Effect of magnetic frustrations on magnetism of the Fe3BO5 and Co3BO5 ludwigites / Y. V. Knyazev [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 474. - P. 493-500, DOI 10.1016/j.jmmm.2018.10.126. - Cited References: 33. - The Russian Foundation for Basic Research, Russia (project no. 17-02-00826-a ). S.G.O. thanks the Russian Academy of Science , Russia (project no. 0356-2017-0030 ) for financial support. J.B. and A.A. acknowledge the financial support of the Spanish MINECO-MAT2017-83468R project, Aragonese E-12 17R RASMIA (co-funded by Fondo Social Europeo), and the European Union (FEDER (ES)). . - ISSN 0304-8853
Кл.слова (ненормированные):
Antiferromagnetics -- Superexchange interactions -- Frustrations
Аннотация: The magnetic structures of Fe3BO5 and Co3BO5 ludwigites have been studied experimentally by magnetic measurements and theoretically by the combination of the group theoretical analysis and semi empiric calculations of the superexchange interactions. The different collinear spin configurations in the triads 3-1-3 and 4-2-4 including ferromagnetic, antiferromagnetic and dimer have been considered. For Fe3BO5 the antiferromagnetic state with zero magnetic moment per unit cell, showing the lowest energy, results to be the most probable magnetic ground state. The unusual magnetic structure comprising two virtually independent orthogonal subsystems is formed to avoid heavy frustrations of superexchange interactions between the 3-1-3 and 4-2-4 spin ladders. In Co3BO5 the magnetic frustrations present for the Co3+ high-spin state are quenched for a Co3+ low spin state resulting in the ferrimagnetic long-range order. The obtained results are discussed in comparison with experimental magnetic data.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660014, Russian Federation
Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza and Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Pedro Cerbuna 12, Zaragoza, 50009, Spain

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Kazak, N. V.; Казак, Наталья Валерьевна; Nazarenko, I. I.; Назаренко, Илья Иванович; Sofronova, S. N.; Софронова, Светлана Николаевна; Rostovtsev, N. D.; Bartolome, J.; Arauzo, A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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19.

Sofronova, S. N.
Super-Superexchange Influence on Magnetic Ordering in Ni3B2O6 Kotoite / S. N. Sofronova, I. I. Nazarenko // Phys. Status Solidi B. - 2019. - Vol. 256, Is. 10. - Ст. 1900060, DOI 10.1002/pssb.201900060. - Cited References: 22. - The study was carried out with the financial support of the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Science Foundation as part of a research project: “Low-dimensional and frustrated magnetism in nickel oxyborates and manganites with the substitution of manganese by Yang-Teller ions,” No. 18-42-240007. . - ISSN 0370-1972
Кл.слова (ненормированные):
borates -- computational physics -- crystal structure -- density functional theory -- dow dimensional structures -- magnetic materials -- solid solutions
Аннотация: Using ab initio software package WIEN2k, the calculations of electronic propertiesand of the energies of various magnetically ordered structures are carried out and possible mechanisms of magnetic ordering are analyzed in Ni3B2O6. The superexchange (Ni-O-Ni) and super-superexchange interactions (Ni-O-B-O-Ni) are calculated, a magnetic ordering model is proposed.

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Держатели документа:
Kirensky Institute of Physics of Federal Research Center KSC Siberian Branch Russian Academy of Sciences, Akademgorodok, 50, Building No. 38, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Nazarenko, I. I.; Назаренко, Илья Иванович; Софронова, Светлана Николаевна
}
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20.

Polukeev, S. I.
Dependence of superexchange interaction in CrO2 on pressure / S. I. Polukeev, V. A. Gavrichkov, S. G. Ovchinnikov // Международная зимняя школа физиков-теоретиков "Коуровка-XXXVIII" : тезисы докладов : Верхняя Сысерть, 23 - 29 февр. 2020 г. - Екатеринбург, 2020. - P. 70. - Cited References: 3. - Support by RSF grant № 18-12-00022 is acknowledged . - ISBN 978-5-9500855-9-8

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Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Полукеев, Семен Игоревич; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Институт электрофизики УрО РАН; Международная зимняя школа физиков-теоретиков "Коуровка"(38 ; 2020 ; 23-29 февраля ; Верхняя Сысерть, Свердловская обл.); "Коуровка", международная зимняя школа физиков-теоретиков(38 ; 2020 ; февр. ; Верхняя Сысерть, Свердловская обл.)
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