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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Nesterov A. I., Orlov Yu. S., Ovchinnikov S. G., Nikolaev S. V.
Заглавие : Cooperative phenomena in spin crossover systems
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4PO-K-41. - P.943 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Orlov Yu. S., Nikolaev S. V., Nesterov A. I., Ovchinnikova T. M.
Заглавие : Effect of the interatomic exchange interaction on the magnetic phase transitions in spin crossover systems under high-pressure
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 6. - P.1177-1179. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783418060276
Примечания : Cited References: 5. - This study was supported by the Russian Foundation for Basic Research, Government of the Kras-noyarsk Territory, and Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, projects nos. 16-42-243048 and 16-42-240413, the Grant Council of the President of the Russian Federation, project no. SP-1844.2016.1, and the Russian Foundation for Basic Research, projects nos. 16-02-00507, 16-02-00273, and 18-02-00453.
Аннотация: The phase diagram of an antiferromagnet with the spin crossover from the high-spin to low-spin state with S = 0 with increasing external pressure has been calculated with regard to the pressure dependence of the exchange integral. The calculated results are compared with the experimental data on ferropericlase Fe x Mg1 – xO.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Nesterov A. I., Ovchinnikov S. G.
Заглавие : Magnetic and structural phase transitions in systems with spin crossover under pressure
Коллективы : Government of Krasnoyarsk region by the Krasnoyarsk Regional Foundation for Support of the Scientific and Scientific-Technical Activity [16-42-243048, 16-42-240746, 16-42-240413], Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools [SP-1844.2016.1, NSh-7559.2016.2], Foundation for the Development of Theoretical Physics "Bazis"; Russian Foundation for Basic Research [17-02-00826, 16-02-00507, 16-02-00098, 16-02-00273]
Место публикации : JETP Letters. - 2017. - Vol. 105, Is. 12. - P.771-774. - ISSN 0021-3640, DOI 10.1134/S0021364017120104. - ISSN 1090-6487(eISSN)
Примечания : Cited References:12. - This work was supported by the Government of Krasnoyarsk region, by the Krasnoyarsk Regional Foundation for Support of the Scientific and Scientific-Technical Activity (project nos. 16-42-243048, 16-42-240746, and 16-42-240413), by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project nos. SP-1844.2016.1 and NSh-7559.2016.2), by the Foundation for the Development of Theoretical Physics "Bazis," and by the Russian Foundation for Basic Research (project nos. 17-02-00826, 16-02-00507, 16-02-00098, and 16-02-00273).
Предметные рубрики: FEBO3
Аннотация: The effect of the exchange interaction between excited high-spin terms of transition metal ions in magnetic Mott–Hubbard insulators on the thermodynamics of the system with singlet terms of ions in the ground state near the crossover of singlet and high-spin terms with the increase in the pressure is studied with the effective Hamiltonian. It is shown that the crossover at the temperature below the critical T* ‹ TN is a first-order phase transition and is accompanied by a volume jump. The crossover at the temperature above T* is accompanied by a smooth change in the crystal volume.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., Orlov Yu. S., Ovchinnikov S. G., Nikolaev S. V.
Заглавие : Cooperative phenomena in spin crossover systems
Коллективы : Russian Foundation for Basic Research; Krasnoyarsk Territory; Krasnoyarsk Region Science and Technology Support Fund for research Projects [16-42-243048, 16-42-240413, 16-42-240746, 16-43-240505]; Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, Projects [SP-1844.2016.1, NSh-7559.2016.2]; Russian Foundation for Basic Research, Projects [16-02-00507, 16-02-00098, 16-02-00273]; CONACyT
Место публикации : Phys. Rev. B: American Physical Society, 2017. - Vol. 96, Is. 13. - Ст.134103. - ISSN 2469-9950, DOI 10.1103/PhysRevB.96.134103. - ISSN 2469-9969(eISSN)
Примечания : Cited References:85. - The reported study was funded by the Russian Foundation for Basic Research; the government of Krasnoyarsk Territory; the Krasnoyarsk Region Science and Technology Support Fund for research Projects No. 16-42-243048, No. 16-42-240413, No. 16-42-240746, and No. 16-43-240505; the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, Projects No. SP-1844.2016.1 and No. NSh-7559.2016.2; and the Russian Foundation for Basic Research, Projects No. 16-02-00507, No. 16-02-00098, and No. 16-02-00273. A. I. N. acknowledges the support from CONACyT.
Предметные рубрики: ISING-LIKE MODEL
EARTHS LOWER MANTLE
MEAN-FIELD APPROACH
Аннотация: Within the framework of a realistic multiband p-d model, we derived an effective Hamiltonian to describe the exchange interaction effects near the spin crossover in magnetic Mott-Hubbard insulators under pressure. It is shown that the single-ion mechanism of spin crossover under the change in the crystal field does not lead to a thermodynamic phase transition; however, at T = 0 a quantum phase transition appears. It has been found that the cooperativity leads to a modification of the quantum phase transition to a first-order phase transition and the appearance of metastable states of the system. The pressure-temperature phase diagram has been obtained to describe the magnetization and high-spin population near the spin crossover of Mott's insulators with d6 ions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., Ramirez M. F., Ovchinnikov S. G.
Заглавие : Quench dynamics and defects formation in the Ising chain in a transverse magnetic field
Место публикации : Eur. Phys. J. B. - 2022. - Vol. 95, Is. 4. - Ст.73. - ISSN 14346028 (ISSN), DOI 10.1140/epjb/s10051-022-00331-y
Примечания : Cited References: 36. - AIN acknowledges the support by the CONACyT. The work by SGO is supported by the Russian Scientific Foundation under the grant 18-12-00022
Аннотация: We study quench dynamics and defects formation in the one-dimensional quantum Ising chain in a time-dependent transverse magnetic field, given by a semi-infinite pulse and as the pulse of the finite width. The system’s final state depends on the quench time and pulse amplitude, resulting in the emergence of topological defects, and consists of a mixture of ground and excited states. We obtain a new analytical expression, generalizing the Landau–Zener (LZ) and adiabatic-impulse (AI) approximation formulas for the asymptotic probability of remaining in the ground state. We show that our theoretical predictions are in good agreement with the results of the numerical simulations, even when the LZ and AI approximations fail.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A.I., Ovchinnikov S. G.
Заглавие : Spin crossover: the quantum phase transition induced by high pressure
Место публикации : Письма в ЖЭТФ. - Москва: Федеральное государственное унитарное предприятие Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Наука, 2009. - Т. 90, № 7. - С. 580-583. - ISSN 0370-274X
Аннотация: The relationship is established between the Berry phase and spin crossover in condensed matter physics induced by high pressure. It is shown that the geometric phase has topological origin and can be considered as the order parameter for such transition.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Ovchinnikov S. G., Nesterov A. I.
Заглавие : Ultrafast Quantum Relaxation Dynamics of Magnetically Ordered Systems with Spin Crossover in an Excited State under a Sudden Perturbation
Место публикации : JETP Letters. - 2020. - Vol. 112, Is. 4. - P.250-256. - ISSN 0021-3640, DOI 10.1134/S0021364020160109. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 27. - This work was supported by the Russian Science Foundation (project no. 18-12-00022)
Аннотация: A theoretical model based on the relaxation equation for the density matrix has been proposed to describe the ultrafast time dynamics of magnetically ordered systems with spin crossover in an excited state under a sudden perturbation. Oscillations of the magnetization, the population of the high-spin state, and the generation of local vibrons at a transition of the system from the light-excited Franck-Condon low-spin state to the highspin ground state.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu. S., Nikolaev S. V., Nesterov A. I., Ovchinnikov S. G.
Заглавие : Light-induced ultrafast dynamics of spin crossovers under high pressure
Место публикации : J. Exp. Theor. Phys. - 2021. - Vol. 132, Is. 3. - P.399-415. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776121030079
Примечания : Cited References: 71. - The authors thank the Russian Scientific Foundation for the financial support under the grant 18-12-00022
Аннотация: Within the multielectron model of magnetic insulator with two different spin terms at each cation and spin crossover under high pressure we have studied dynamics of a sudden excited non equilibrium spin state. We obtain the different relaxation of the magnetization, high spin/low spin occupation numbers, and the metal-oxygen bond length for different values of the external pressure. For each pressure-temperature values stationary state agrees to the mean field phase diagrams. We found the long living oscillations of magnetization for the high spin ground state at small pressure. Close to crossover pressure the smooth relaxation is accompanied with a set of sharp strongly non linear oscillations of magnetization and HS/LS occupation numbers that are accompanied by the Franck–Condon resonances.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., de la Cruz F. A.
Заглавие : Magnetic monopoles with generalized quantization condition
Место публикации : Phys. Lett. A. - 2002. - Vol. 302, Is. 5-6. - P.253-260. - ISSN 0375-9601, DOI 10.1016/S0375-9601(02)01172-6
Примечания : Cited References: 33
Предметные рубрики: QUANTUM-MECHANICS
DIRAC MONOPOLE
3-COCYCLE
SPACE
Ключевые слова (''Своб.индексиров.''): monopole--nonunitary representations--nonassociativity--gauge loop--quasigroups--gauge loop--monopole--nonassociativity--nonunitary representations--quasigroups--article--calculation--magnetic field--mathematics--quantum mechanics--rotation--theory
Аннотация: Theory of pointlike magnetic monopole with an arbitrary magnetic charge is considered. It is shown that a proper description requires making use of nonunitary representations of the rotation group and the nonassociative generalization of the gauge group and fibre bundle theory. (C) 2002 Elsevier Science B.V. All rights reserved.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grachev A. V., Nesterov A. I., Ovchinnikov S. G.
Заглавие : The gauge-theory of point-defects
Место публикации : Phys. Status Solidi B. - 1989. - Vol. 156, Is. 2. - P.403-410. - ISSN 0370-1972, DOI 10.1002/pssb.2221560203
Примечания : Cited References: 22
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