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Spin-polaron nature of fermion quasiparticles and their d-wave pairing in cuprate superconductors

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Abstract

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-T c superconductors (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.

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Authors and Affiliations

  1. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia

    V. V. Val’kov & D. M. Dzebisashvili

  2. Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, 108840, Russia

    A. F. Barabanov

Authors
  1. V. V. Val’kov
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  2. D. M. Dzebisashvili
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  3. A. F. Barabanov
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Correspondence to V. V. Val’kov.

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Original Russian Text © V.V. Val’kov, D.M. Dzebisashvili, A.F. Barabanov, 2016, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 104, No. 10, pp. 745–757.

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Val’kov, V.V., Dzebisashvili, D.M. & Barabanov, A.F. Spin-polaron nature of fermion quasiparticles and their d-wave pairing in cuprate superconductors. Jetp Lett. 104, 730–741 (2016). https://doi.org/10.1134/S002136401622015X

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