Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Коршунов, Максим Михайлович, Тогушова Ю. Н.
Заглавие : Взаимосвязь сверхпроводимости и магнитных возбуждений в многоорбитальных системах
Место публикации : Вестн. Новосиб. гос. ун-та. Сер.: Физика. - 2015. - Т. 10, Вып. 2. - С. 83-90. - ISSN 1818-7994
Примечания : Библиогр.: 29 назв. - Материал данной работы был доложен на семинаре ОКНО-2014. Работа была выполнена при поддержке Минобрнауки РФ ГФ-2 (СФУ), РФФИ (грант 13-02-01395), программы Президиума РАН № 20.7, при государственной поддержке ведущих научных школ НШ-2886.2014.2, фонда «Династия» и МЦФФМ
Ключевые слова (''Своб.индексиров.''): сверхпроводники на основе железа--спин-резонансный пик--спиновая восприимчивость--fe-based superconductors--spin-resonance peak--spin susceptibility
Аннотация: Рассмотрено влияние нетривиального сверхпроводящего параметра порядка на магнитную восприимчивость в многоорбитальной модели соединений железа. Показано, как формируется спин-резонансный пик, обсуждается его связь с экспериментальными данными по неупругому рассеянию нейтронов.We have considered the impact of the nontrivial superconducting order parameter on the magnetic susceptibility within the multiorbital model for the iron-based materials. The formation of the spin-resonance peak is demonstrated and its connection to the experimental data on the inelastic neutron scattering is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zlotnikov A. O.
Заглавие : Majorana vortex modes in spin-singlet chiral superconductors with noncollinear spin ordering: Local density of states study
Место публикации : Phys. Rev. B. - 2023. - Vol. 107, Is. 14. - Ст.144513. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.107.144513. - ISSN 24699969 (eISSN)
Примечания : Cited References: 71. - I am grateful for fruitful discussions with participants of the seminar of Laboratory of Theoretical Physics in Kirensky Institute of Physics, especially with V. V. Val'kov, S. V. Aksenov, A. D. Fedoseev, and M. S. Shustin. The reported study was funded by the Theoretical Physics and Mathematics Advancement Foundation “BASIS”
Аннотация: In this study, topologically nontrivial edge and vortex bound states are described in the coexistence phase of chiral spin-singlet superconductivity and noncollinear spin ordering on a triangular lattice in the presence of few (up to four) vortices. We consider the topological phase transition induced by the magnetic order between the phase hosting Majorana modes and the initial phase of the chiral d-wave superconductivity supporting non-Majorana modes which is also topologically nontrivial. The change of the excitation spectrum at the critical point is obtained in both cases of open and periodic boundary conditions in the presence of vortices. It is proved that zero-energy Majorana modes localized at vortex cores are caused by noncollinear long-range magnetic ordering. Even though nearby excitation energies of subgap states including the edge-localized and vortex-localized states are very close to each other, the energy difference between different vortex bound states is an order of magnitude higher. This difference determines the energy gap for Majorana vortex modes separating them from other vortex bound states. It is found that even in the presence of noncollinear spin ordering its value can be estimated from the excitation energy of vortex bound states in the pure chiral d-wave state for the nonmagnetic case. By studying local density of states near the vortex cores the possibility to experimentally detect the described Majorana vortex modes by scanning tunneling microscopy is discussed. It is demonstrated that Majorana vortex modes and Majorana antivortex modes induced by noncollinear magnetism have different features in energy and spatially resolved density of states due to the chiral symmetry on the superconducting order parameter.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zlotnikov A. O.
Заглавие : Majorana fermions in strongly correlated system with coexisting superconductivity and noncollinear spin ordering
Коллективы : International Conference on Spectroscopies in Novel Superconductors
Место публикации : SNS 2019 Spectroscopies in novel superconductors: Abstract [Program]. - 2019. - Ст.P-MO-31. - P.91
Примечания : Cited References: 3. - This study was funded by the Russian Foundation for Basic Research (No. 19-02-00348а) and the Grant of the President of the Russian Federation MK-3594.2018.2
Аннотация: At present, a new mechanis m of the formation of the Majorana edge states in topological spin-singlet superconductors due to the presence of the long- range magnetic order is often considered [1- 3]. We show a formation of the coexistence state of chiral d+id superconductivity and noncollinear 120-degree spin ordering in the strongly correlated Mott- Hubbard system with a triangular lattice (such as NaxCoO2). There exist different topologically nontrivial phases characterized by the invariant N3in the coexistence stateю The topologicaltransitions between such phases occur upon increasingelectron doping. By solving the system of equations for the Green functions the appearance of Majorana fermions in the coexistence phase is shown. With strong correlation effects the Majorana fermion c an be defined as the specificsuperposition of electron-like and hole-like Hubbard fermions.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Мягков, Виктор Григорьевич, Быкова, Людмила Евгеньевна, Жигалов, Виктор Степанович, Середкин, Виталий Александрович, Турпанов, Игорь Александрович, Юшков, Василий Иванович, Патрин, Геннадий Семёнович, Тамбасов, Игорь Анатольевич, Мацынин, Алексей Александрович, Рыбакова, Александра Николаевна, Великанов, Дмитрий Анатольевич, Бондаренко, Галина Николаевна
Заглавие : Why in cuprate superconductors the d-wave superconductivity emerges rather than s-wave
Коллективы : Южный федеральный университет, "Порядок, беспорядок и свойства оксидов", международный междисциплинарный симпозиум, "Order, Disorder and Properties of Oxides", International interdisciplinary seminar
Место публикации : 19-й Междунар. симп. "Порядок, беспорядок и свойства оксидов" (ODPO-19): труды симпозиума. - 2016. - Вып. 19, Т. 1. - С. 48-49
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Altin E., Gokhfeld D. M., Demirel S., Oz E., Kurt F., Altin S., Yakinci M.E.
Заглавие : Vortex pinning and magnetic peak effect in Eu(Eu,Ba)2.125Cu3Ox
Место публикации : J. Mater. Sci.-Mater. Electron.: Springer, 2014. - Vol. 25, Is. 3. - P.1466-1473. - ISSN 0957-4522, DOI 10.1007/s10854-014-1753-1. - ISSN 1573-482X
Примечания : Cited References: 30
Предметные рубрики: SUPERCONDUCTORS
FIELD
NANOCRYSTALLINE
TEMPERATURE
LOOP
Аннотация: Eu–Ba–Cu–O composition was synthesized by solid state reaction technique. To determine optimum growth temperature, heat treatment was examined on the material at 880–1,100 °C. Microstructural evolution, phase formation and elemental distribution depending on heat treatments were examined by using X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscope analysis. Optimum fabrication conditions were determined as 1,020 °C for 24 h under oxygen atmosphere and detailed characterization of corresponding compound was performed. The magnetization hysteresis loops are expounded to be the product of superconducting Eu-123 grains and magnetic Eu2+ ions. The peak effect on the magnetization curves was described by the extended critical state model. Scaling of the pinning force was found such that the peak position is proportional to the irreversibility field H irr and the maximum pinning force is proportional to H irr 2 .
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : VALKOV V. V., KHRUSTALEV B. P.
Заглавие : MAGNETIZATION OF GRANULATED HTSC IN INTENSE MAGNETIC-FIELDS
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz.: MEZHDUNARODNAYA KNIGA, 1995. - Vol. 107, Is. 4. - P1221-1231. - ISSN 0044-4510
Примечания : Cited References: 18
Предметные рубрики: CRITICAL-STATE MODEL
HIGH-TEMPERATURE SUPERCONDUCTORS
HIGH-TC SUPERCONDUCTORS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Valkov V. V., Dzebisashvili D. M.
Заглавие : Influence of antiferromagnetic ordering on the de Haas-van Alphen effect in a semimetal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1997. - Vol. 39, Is. 2. - P179-184. - ISSN 1063-7834, DOI 10.1134/1.1129779
Примечания : Cited References: 19
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTORS
NORMAL STATE
OSCILLATIONS
CEAS
Аннотация: The distinctive characteristics of the de Haas-van Alphen effect in semimetals with antiferromagnetic long-range order are investigated theoretically. It is shown that the transition of the subsystem of localized spins from the canted antiferromagnetic phase to the ferromagnetic phase is accompanied by an abrupt change in the ''frequency'' of the magnetization oscillations of band carriers M-similar to. In the below-critical range of magnetic fields, M-similar to is not a function periodic in 1/H. Significantly, the additional contribution to the phase of the oscillatory factors is proportional to H-2 and is determined entirely by quantum fluctuations in the antiferromagnetic subsystem. (C) 1997 American Institute of Physics.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Valkov V. V., Dzebisashvili D. M., Barabanov A. F.
Заглавие : Generalized Kondo lattice model and its spin-polaron realization by the projection method for cuprates
Коллективы : Russian Foundation for Basic Research [16-02-00073, 16-02-00304, 16-42-240435]; Siberian Branch of the Russian Academy of Sciences (Complex Program) [II.2P, 0358-2015-0005]
Место публикации : Theor. Math. Phys.: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 191, Is. 2. - P.752-763. - ISSN 0040-5779, DOI 10.1134/S0040577917050142. - ISSN 1573-9333(eISSN)
Примечания : Cited References:35. - This research was supported by the Russian Foundation for Basic Research (Grant No. 16-02-00073, 16-02-00304, and 16-42-240435) and the Siberian Branch of the Russian Academy of Sciences (Complex Program No. II.2P, Grant No. 0358-2015-0005).
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
COPPER OXIDES
Ключевые слова (''Своб.индексиров.''): strong electron correlation--spin-fermion model--kondo lattice model--spin polaron
Аннотация: The spin-fermion model, which is an effective low-energy realization of the three-band Emery model after passing to the Wannier representation for the px and py orbitals of the subsystem of oxygen ions, reduces to the generalized Kondo lattice model. A specific feature of this model is the existence of spin-correlated hoppings of the current carriers between distant cells. Numerical calculations of the spectrum of spin-electron excitations highlight the important role of the long-range spin-correlated hoppings.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Golovnya A. A., Dzebisashvili D. M.
Заглавие : The role of anomalous strength operator in the high-T (c) superconductivity theory
Разночтения заглавия :авие SCOPUS: The role of anomalous strength operator in the high- Tc superconductivity theory
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2006. - Vol. 378-80: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P465-466. - ISSN 0921-4526, DOI 10.1016/j.physb.2006.01.202
Примечания : Cited References: 3
Ключевые слова (''Своб.индексиров.''): superconductivity--t-j-model--superconductivity--t- j-model--approximation theory--frequencies--mathematical operators--numerical methods--superconducting transition temperature--superconductivity--hubbard operator--matsubara frequency--t- j-model--high temperature superconductors
Аннотация: The diagram series structure for Matsubara Green's functions in the Hubbard operators representation have been analyzed for the superconducting (SC) phase in the t-J-model. It has been found that the Hubbard operator diagram technique besides anomalous self-energy operator includes also anomalous strength operator (ASO). With account for ASO Gor'kov equations have been written. ASO are shown to be very essential when anomalous averages are calculated. The anomalous self-energy operator and ASO were derived in one-loop approximation. It has turned out that strength operator components depend oil Matsubara frequency. As a result the SC phase is described by infinite set of integral equations. When deriving the equation for transition temperature in SC phase with s- and d-order parameter symmetry this system has been solved exactly. On the basis of numerical calculations it has been found that the account for strength operator components has fully suppressed SC phase with s-order parameter symmetry in the t-J-model. (c) 2006 Elsevier B.V. All rights reserved.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Dzebisashvili D. M., Barabanov A. F.
Заглавие : Spin-polaron nature of fermion quasiparticles and their d-wave pairing in cuprate superconductors
Место публикации : JETP Letters. - 2016. - Vol. 104, Is. 10. - P.730-741. - ISSN 00213640 (ISSN), DOI 10.1134/S002136401622015X
Примечания : Cited References: 52
Аннотация: In the framework of the spin-fermion model, to which the Emery model is reduced in the limit of strong electron correlations, it is shown that the fermion quasiparticles in cuprate high-Tcsuperconductors (HTSCs) arise under a strong effect of exchange coupling between oxygen holes and spins of copper ions. This underlies the spin-polaron nature of fermion quasiparticles in cuprate HTSCs. The Cooper instability with respect to the d-wave symmetry of the order parameter is revealed for an ensemble of such quasiparticles. For the normal phase, the spin-polaron concept allows us to reproduce the fine details in the evolution of the Fermi surface with the changes in the doping level x observed in experiment for La2-xSrxCuO4. The calculated T–x phase diagram correlates well with the available experimental data for cuprate HTSCs. © 2016, Pleiades Publishing, Inc. All Right Reserved.
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