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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : Effect of Coulomb repulsion on the London penetration depth in cuprate superconductors
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00837, 20-32-70059]; Government of Krasnoyarsk Region; Krasnoyarsk Regional Science and Technology Support Fund [18-42-240014, 18-42-243002]; Council for Grants of the President of the Russian Federation [MK-1641.2020.2]
Место публикации : Phys. Scr. - 2020. - Vol. 95, Is. 6. - Ст.065806. - ISSN 0031-8949, DOI 10.1088/1402-4896/ab8163. - ISSN 1402-4896(eISSN)
Примечания : Cited References: 57. - The work was financially supported by the Russian Foundation for Basic Research (project #18-02-00837, #20-32-70059), the Government of Krasnoyarsk Region, the Krasnoyarsk Regional Science and Technology Support Fund (projects: #18-42-240014 'One-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors' and #18-42-243002 'Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors'). The work of KKK was supported by the Council for Grants of the President of the Russian Federation (project MK-1641.2020.2).
Предметные рубрики: ELECTRONIC-STRUCTURE
SUPERFLUID DENSITY
QUASI-PARTICLES
2-BAND MODEL
Аннотация: We study the effect of Coulomb repulsion between oxygen holes on the London penetration depth λ based on the concept of spin-polaron nature of Fermi quasiparticles in cuprates superconductors. It is shown that for the generally accepted values of the parameters of the spin-fermion model, taking into account the Coulomb interaction, both the one-site Hubbard U p and interaction between holes on the next-nearest-neighbor oxygen ions V 2, allows one to achieve a much better agreement of the calculated temperature dependencies of the value λ −2 with the experimental data in La2−x Sr x CuO4 in a wide range around optimal doping.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : Effect of Coulomb repulsion on the London penetration depth in cuprate superconductors [Electronic resource]
Место публикации : ArXiv. - 2019. - Ст.1912.04577
Вид и объем ресурса: Electronic text data
Примечания : Cited References: 55. - The work was financially supported by the Presidium of the Russian Academy of Sciences the Program No.12 ”Fundamental problems of high-temperature superconductivity”, the Russian Foundation for Basic Research (project #18-02-00837, #20-32-70059), the Government of Krasnoyarsk Region, the Krasnoyarsk Regional Science and Technology Support Fund (projects: #18-42-240014 ”One-orbit effective model of an ensemble of spin-polaron quasiparticles in the problem of describing the intermediate state and pseudogap behavior of cuprate superconductors” and #18-42-243002 ”Manifestation of spin-nematic correlations in spectral characteristics of electronic structure and their influence on practical properties of cuprate superconductors”). The work of K.K.K. was supported by the Council for Grants of the President of the Russian Federation (project MK-3722.2018.2).
Предметные рубрики: Superconductivity
Strongly Correlated Electrons
Аннотация: We study the effect of Coulomb repulsion between oxygen holes on the London penetration depth λ based on the concept of spin-polaron nature of Fermi quasiparticles in cuprates superconductors. It is shown that for the generally accepted values of the parameters of the spin-fermion model, taking into account the Coulomb interaction, both the one-site Hubbard Up and interaction between the holes on next-nearest-neighbor oxygen ions V2, allows one to achieve a much better agreement of the calculated temperature dependencies of the value λ−2 with the experimental data in La2−xSrxCuO4 with optimal doping.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : Effective indirect multi-site spin-spin interactions in the s-d(f) model
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН , Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-240435, 16-42-243057]; Russian Federation [MK-1398.2017.2]
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P.57-59. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2016.12.075. - ISSN 1873-4766(eISSN)
Примечания : Cited References:21. - The work was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research (project nos. 16-42-240435, and 16-42-243057). The work of K.K. Komarov was supported by the grant of the President of the Russian Federation (Project MK-1398.2017.2).
Предметные рубрики: BIQUADRATIC EXCHANGE
LATTICE
Ключевые слова (''Своб.индексиров.''): s-d(f) exchange model--mult i-site spin-spin interactions
Аннотация: Using the diagram technique for Matsubara Green's functions it is shown that the dynamics of the localized spin subsystem in the s-d(f) model can be described in terms of an effective spin model with multi-site spin-spin interactions. An exact representation of the action for the effective purely spin model is derived as an infinite series in powers of s-d(f) exchange interaction J. The indirect interactions of the 2nd, 3rd and 4th order are discussed.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : Effective multicenter spin-spin interactions from the s–d(f)-model
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.P1.8. - P.68. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 2. - The work was supported by the RNF 16-12-10153
Ключевые слова (''Своб.индексиров.''): s-d(f)-exchange model--multicenter spin-spin interactions
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dzebisashvili D. M., Komarov K. K.
Заглавие : London penetration depth in the ensemble of spin polarons of cuprate superconductors
Коллективы : Russian Foundation for Basic Research (RFBR) [18-02-00837]; Presidium of the Russian Academy of Sciences [12]; Russian Federation [MK-1398.2017.2]; RFBR; Government of Krasnoyarsk Region; Krasnoyarsk Region Science and Technology Support Fund [18-42-243002]
Место публикации : Eur. Phys. J. B. - 2018. - Vol. 91, Is. 11. - Ст.278. - ISSN 1434-6028, DOI 10.1140/epjb/e2018-90266-6. - ISSN 1434-6036(eISSN)
Примечания : Cited References: 82. - We would like to thank V.V. Val'kov, A.F. Barabanov, and M.M. Korovushkin for helpful and stimulating discussions. The work was financially supported by the Russian Foundation for Basic Research (RFBR) (project no. 18-02-00837) and by the program of the Presidium of the Russian Academy of Sciences No. 12 "Fundamental problems of high-temperature superconductivity". The work of K. K. K. was supported by the grant of the President of the Russian Federation (project MK-1398.2017.2) and the RFBR and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (project no. 18-42-243002).
Предметные рубрики: INTERSITE COULOMB REPULSION
HIGH-TC SUPERCONDUCTIVITY
NARROW
Ключевые слова (''Своб.индексиров.''): solid state and materials
Аннотация: Within the spin-polaron concept for hole-doped cuprates superconductors the temperature and doping dependence of the London penetration depth λ is studied. To calculate λ we developed a novel approach which (i) does not suppose the analytical expression for the quasiparticle spectrum to be known in advance, and (ii) allows to take into account the strong coupling between a spin localized on the copper ion and a hole residing on the four nearest oxygen ions rigorously. Within this approach the expression for supercurrent density j➝ is obtained in the long-wavelength limit for external magnetic field vector potential. It is shown that j➝ is mainly due to the spin-polaron quasiparticles rather then bare oxygen holes. Temperature dependence of λ−2 at various doping is calculated and compared with available experimental data. It is argued that the inflection point revealed experimentally in the temperature behavior of λ−2 in La1.83Sr0.17CuO4 may be considered as a manifestation of the spin-polaron nature of quasiparticles in cuprates.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : On the origin of the inflection point in the temperature dependence of the london penetration depth in cuprate superconductors
Коллективы : International Conference on Supercondactivity and Magnetism
Место публикации : International conference on supercondactivity and magnetism (ICSM2021): abstract book. - 2021. - P.75
Примечания : Cited References: 5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Dzebisashvili D. M., Korovushkin M. M., Komarov K. K., Barabanov A. F.
Заглавие : Strong Spin-Charge Coupling and Its Manifestation in the Quasiparticle Structure, Cooper Instability, and Electromagnetic Properties of Cuprates
Коллективы : "Fundamental problems in high-temperature superconductivity" of the Presidium of the Russian Academy of Sciences, Russian Foundation for Basic Research [12, 18-02-00837]; Krasnoyarsk Krai Foundation for Supporting the Scientific and Technical Activity [18-42-243002, 18-42-243018, 18-42-240014]; President of the Russian Federation [MK-37.2019.2, MK-3722.2018.2]; Russian Foundation for Basic Research [19-02-00509]
Место публикации : J. Exp. Theor. Phys. - 2019. - Vol. 128, Is. 6. - P.885-898. - ISSN 1063-7761, DOI 10.1134/S1063776119050078. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 83. - This study was supported by the program no. 12 "Fundamental problems in high-temperature superconductivity" of the Presidium of the Russian Academy of Sciences, Russian Foundation for Basic Research (project no. 18-02-00837), the administration of the Krasnoyarsk Krai, Krasnoyarsk Krai Foundation for Supporting the Scientific and Technical Activity under project nos. 18-42-243002 (Manifestations of spin-nematic correlations in spectral characteristics of the electronic structure and their influence on the properties of cuprate superconductors in applications), 18-42-243018 (Contact phenomena and magnetic disorder in the problem of formation and detection of topologically protected edge states in semiconducting nanostructures), and 18-42-240014 (Single-orbital effective model of an ensemble of spin-polaron quasiparticles in the problem of description of the intermediate state and pseudogap behavior of cuprate superconductors), as well as the Council for grants from the President of the Russian Federation (project nos. MK-37.2019.2 and MK-3722.2018.2). The work of A.F.B was supported by the Russian Foundation for Basic Research (project no. 19-02-00509).
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTIVITY
INTERSITE COULOMB REPULSION
Аннотация: The Fermi excitation spectrum, the problem of Cooper instability, and the Londons magnetic field penetration depth in cuprate superconductors are considered using the unified conception based on accounting for the strong coupling between the spin of copper ions and holes at oxygen ions. This coupling leads to strong renormalization of the primary spectrum of oxygen holes with the formation of spin-polaron quasiparticles. Analysis of Cooper instability performed using the spin-polaron concept for different channels has shown that only the superconducting d-wave pairing occurs in the ensemble of spin-polaron quasiparticles, and there are no solutions corresponding to the s-wave pairing. It has been demonstrated that the superconducting d-wave pairing is not suppressed by the Coulomb repulsion of holes located at neighboring oxygen ions. This effect is due to peculiarities in the crystallographic structure of the CuO2 plane and the aforementioned strong spin-fermion coupling. As a result, such interaction of holes is omitted in the kernel of the integral equation for the superconducting order parameter with the d-wave symmetry. It has been shown the Hubbard repulsion of holes and their interaction for the second coordination sphere of the oxygen sublattice for actual intensities of the interaction do not suppress the d-wave type of superconductivity. For the spin-polaron ensemble, we have analyzed the dependence of the Londons magnetic field penetration depth on the temperature and hole concentration. It has been established that the peculiarities of this dependence are closely related to specific features of the spin-polaron spectrum.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : The effect of coulomb repulsion on the london penetration depth in cuprate superconductors
Коллективы : 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", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : 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.P2. - P.76. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 7. - The work was financially supported by the Russian Foundation for Basic Research (RFBR) (project no. 18-02-00837) and by the program of the Presidium of the Russian Academy of Sciences No. 12 ported by the grant of the President of the Russian Federation (projects MK-3722.2018.2) and partly by the Government of Krasnoyarsk Region and the Krasnoyarsk Region Science and Technology Support Fund (projects no. 18-42-240014, 18-42-243002, 18-42-243017)”Fundamental problems of high-temperature superconductivity”. The work of K.K. Komarov was sup
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komarov K. K., Dzebisashvili D. M.
Заглавие : The origin of an inflection point on the temperature dependence of the London penetration depth in hole-doped cuprate high-temperature superconductors
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00837, 20-3270059]
Место публикации : J. Exp. Theor. Phys. - 2021. - Vol. 133, Is. 3. - P.351-359. - ISSN 1063-7761, DOI 10.1134/S1063776121080021. - ISSN 1090-6509(eISSN)
Примечания : Cited References: 77. - This work was supported by the Russian Foundation for Basic Research, project nos. 18-02-00837 and 20-3270059
Предметные рубрики: MUON-SPIN-ROTATION
QUASI-PARTICLES
FERMI-SURFACE
Аннотация: A scenario of the formation of an experimentally observed inflection point on the temperature dependence of the London penetration depth λ in cuprate high-temperature superconductors (HTSCs) with optimal hole doping is discussed within the spin-polaron concept. It is shown that the reason for the appearance of an inflection point on the 1/λ2(T) dependence is due to the features of the energy spectrum of spin-polaron quasiparticles in the superconducting phase, as well as to the specific temperature dependence of their spectral density.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Дзебисашвили, Дмитрий Михайлович, Комаров, Константин Константинович
Заглавие : Лондоновская глубина проникновения в ансамбле спин-поляронных квазичастиц купратных сверхпроводников
Коллективы : Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Международная зимняя школа физиков-теоретиков ("Коуровка"), "Коуровка", международная зимняя школа физиков-теоретиков
Место публикации : "Коуровка", международная зимняя школа физиков-теоретиков (37 ; 2018 ; 25 февр. - 3 марта ; Верхняя Сысерть, Свердловская обл.). Международная зимняя школа физиков-теоретиков "Коуровка-XXXVII": тезисы докладов. - Екатеринбург, 2018. - С. 63
Примечания : Библиогр.: 6
Аннотация: На основе спин-поляронного подхода рассчитана Лондоновская глубина проникновения λ в купратных ВТСП. Обсуждаются особенности концентрационных и температурных зависимостей λ, обусловленные спин-поляронной природой фермиевских квазичастиц.
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