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London penetration depth in the ensemble of spin polarons of cuprate superconductors

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  • Dmitry M. Dzebisashvili

    (Kirensky Institute of Physics, Federal Research Center KSC SB RAS
    Reshetnev Siberian State University of Science and Technology)

  • Konstantin K. Komarov

    (Kirensky Institute of Physics, Federal Research Center KSC SB RAS)

Abstract

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 j⃗ is obtained in the long-wavelength limit for external magnetic field vector potential. It is shown that j⃗ 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.

Suggested Citation

  • Dmitry M. Dzebisashvili & Konstantin K. Komarov, 2018. "London penetration depth in the ensemble of spin polarons of cuprate superconductors," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 91(11), pages 1-15, November.
    • Handle: RePEc:spr:eurphb:v:91:y:2018:i:11:d:10.1140_epjb_e2018-90266-6
    DOI: 10.1140/epjb/e2018-90266-6
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    Solid State and Materials;

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