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Dzebisashvili, D. M.
London penetration depth in the ensemble of spin polarons of cuprate superconductors / D. M. Dzebisashvili, K. K. Komarov // Eur. Phys. J. B. - 2018. - Vol. 91, Is. 11. - Ст. 278, DOI 10.1140/epjb/e2018-90266-6. - 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). . - ISSN 1434-6028. - ISSN 1434-6036

РУБ Physics, Condensed Matter
Рубрики:
INTERSITE COULOMB REPULSION
HIGH-TC SUPERCONDUCTIVITY
NARROW
Кл.слова (ненормированные):
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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Держатели документа:
RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Komarov, K. K.; Комаров, Константин Константинович; Дзебисашвили, Дмитрий Михайлович; 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]
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