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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., Ovchinnikov S. G., Iaroshenko G. A.
Заглавие : Quench dynamics in spin crossover induced by high pressure
Место публикации : Cent. Eur. J. Phys. - 2013. - Vol. 11, Is. 7. - P.894-903. - ISSN 1895-1082, DOI 10.2478/s11534-013-0273-6
Примечания : Art. in press
Ключевые слова (''Своб.индексиров.''): energy level crossing--quantum phase transition--spin crossover
Аннотация: In this paper we have analytically and numerically studied the dynamics of spin crossover induced by time-dependent pressure. We show that quasi static pressure, with a slow dependence on time, yields a spin crossover leading to transition from the high spin (HS) quantum system state to the low spin (LS) state. However, quench dynamics under shockwave load are more complicated. The final state of the system depends on the amplitude and pulse velocity, resulting in the mixture of the HS and LS states. В© 2013 Versita Warsaw and Springer-Verlag Wien.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., Ovchinnikov S. G.
Заглавие : Geometric phases and quantum phase transitions in open systems
Место публикации : Phys. Rev. E: AMER PHYSICAL SOC, 2008. - Vol. 78, Is. 1. - Ст.15202. - ISSN 1539-3755, DOI 10.1103/PhysRevE.78.015202
Примечания : Cited References: 29
Предметные рубрики: POINTS
DEGENERACIES
Ключевые слова (''Своб.индексиров.''): chlorine compounds--electron tunneling--ferromagnetism--ising model--magnetic fields--magnetism--open systems--quantum electronics--quantum optics--sedimentation--effective hamiltonian--eigenvalues--first orders--geometric phase--geometric phases--ground-state--hermitian--one-dimensional--open quantum systems--quantum phase transition--quantum phase transitions--transverse-magnetic fields--phase transitions
Аннотация: The relationship is established between quantum phase transitions and complex geometric phases for open quantum systems governed by a non-Hermitian effective Hamiltonian with accidental crossing of the eigenvalues. In particular, the geometric phase associated with the ground state of the one-dimensional dissipative Ising model in a transverse magnetic field is evaluated, and it is demonstrated that the related quantum phase transition is of the first order.
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3.

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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4.

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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5.

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 : JETP Letters. - 2009. - Vol. 90, Is. 7. - P.530-534. - ISSN 0021-3640, DOI 10.1134/S0021364009190072
Примечания : Cited References: 28
Предметные рубрики: GEOMETRIC PHASES
POINTS
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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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : NESTEROV A. I., Ovchinnikov S. G.
Заглавие : ACOUSTIC-WAVE AMPLIFICATION IN FAST CRYSTALLIZATION
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1988. - Vol. 30, Is. 1. - P184-186. - ISSN 0367-3294
Примечания : Cited References: 14
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7.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Nesterov A. I., Ovchinnikov S. G., Orlov Yu. S.
Заглавие : Effect of interatomic interactions on the spin crossover under high pressure
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P1.49. - P.114. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 4. - This work has been supported by the RAS program, the state task 0358-2015-0006, RFBR Grant no. 16-02-00507 and Scholarship of the President of the Russian Federation СП-1844.2016.1
Ключевые слова (''Своб.индексиров.''): spin crossover--quantum phase transition--high pressure
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8.

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 [Electronic resource]
Место публикации : ArXiv. - 2016. - Ст.1611.10009
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 60. - This work was supported by RFBR and Government of Krasnoyarsk Territory according to the research project 16-42-243048, 16-42-240413, 16-42-240746, by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools, project no. SP-1844.2016.1, NSh-7559.2016.2, Russian Foundation for Basic Research, project nos. 17-02-00826, 17-02-00052, 16-02-00507, 16-02-00098, 16-02-00273. A.I. Nesterov acknowledge the support from the CONACyT.
Аннотация: Within the framework of a realistic multi-band 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 single-ion mechanism of spin crossover under change of 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 the Motts dielectrics with d6-ions.
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9.

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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10.

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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