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

Dmitry M. Dzebisashvili () and Konstantin K. Komarov
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Dmitry M. Dzebisashvili: Kirensky Institute of Physics, Federal Research Center KSC SB RAS
Konstantin K. Komarov: Kirensky Institute of Physics, Federal Research Center KSC SB RAS

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 11, 1-15

Abstract: 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.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2018-90266-6

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