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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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    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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    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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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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Gavrichkov, V. A.
Superexchange in 2D perovskite HTSC with stripe nanostructure / V. A. Gavrichkov // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P. 223-2224. - Библиогр.: 3 назв. - The reported study was supported by the grant RFFI 19-02-00034 and the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science according to the research project ”Studies of superexchange and electron-phonon interactions in correlated systems as a basis for searching for promising functional materials No. 20-42-240016.

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Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; "Functional materials", International conference(2021 ; Oct. 4-8 ; Alushta, Russia); Крымский федеральный университет имени В.И. Вернадского
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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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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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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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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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10.

Sofronova, S. N.
Magnetic ordering and the role of superexchange Ni–O–B–O–Ni upon the formation of magnetic order in ludwigite Ni2MnBO5 from first-principal calculations / S. Sofronova, A. Chernyshev // Comput. Condens. Matter. - 2024. - Vol. 40. - Ст. e00918, DOI 10.1016/j.cocom.2024.e00918. - Cited References: 28 . - ISSN 2352-2143
Кл.слова (ненормированные):
Exchange interactions -- Magnetic order -- Ferrimagnets -- Non-collinear ordering -- Superexchange interactions
Аннотация: The energies of various magnetically ordered structures for ludwigite Ni2MnBO5 have been calculated in the framework of the first-principles approach using the Wien2K program package, with the parameters of exchange interactions being determined. Two subsystems can be distinguished in the magnetic system, which are associated with the triads 4-2-4 and 3-1-3. The magnetic moments of the ions in both triads are antiferromagnetically oriented. The analysis of the exchange contribution to the energy shows that there occurs an increase of the magnetic cell relative to the crystallographic one due to antiferromagnetic ordering of the magnetic moments along the c axis in three-legged ladders formed by 4-2-4 triads. However, in three-legged ladders formed by 3-1-3 triads, the magnetic moments of the ions are ordered along the c-axis ferromagnetically. The predicted type of magnetic ordering in Ni2MnBO5 is similar to magnetic ordering in Fe3BO5. Non-collinear ordering of the magnetic moments of the subsystems at different temperatures is also likely to be observed in Ni2MnBO5, as is the case in Fe3BO5. Superexchange (indirect) interactions (No-O-B-O-Ni) influence the orientation of the magnetic moments of two 3-1-3 (4-2-4) triads within the unit cell. It is these interactions that may be responsible for the formation of long-range magnetic order in Co3BO5 and ferrimagnetic-antiferromagnetic spin-reorientation transition in Fe3BO5.

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Держатели документа:
Kirensky Institute of Physics of the Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Chernyshev, A.; Чернышев, Артем Валерьевич; Софронова, Светлана Николаевна
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