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Origin of the Spin Polaron Quasiparticles and Their Cooper Instability in High-T c Superconductors

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Abstract

In the framework of the spin-fermion model, it is shown that accounting for the strong spin-charge fluctuations between holes of copper and oxygen ions in cuprate High-T c superconductors leads to the formation of the Fermi spin-polaron quasiparticles. It is demonstrated that the large value of the binding energy of such quasiparticle is determined by the processes in which hopping intensity of the oxygen holes depends significantly on the spin configuration of holes on the copper and oxygen ions. It was found that the ensemble of such quasiparticles manifests Cooper instability and the concentration dependence of the critical temperature is in good agreement with the experimental data.

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Acknowledgments

This study was supported by the Russian Foundation for Basic Research, projects nos. 13-02-00523, 13-02-00909 and the Dynasty Foundation.

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Authors and Affiliations

  1. Kirensky Institute of Physics, SB RAS, Krasnoyarsk, 660036, Russia

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

  2. Institute for High Pressure Physics, RAS, Troitsk, Moscow Region, 142098, Russia

    A. F. Barabanov

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  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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Val’kov, V.V., Dzebisashvili, D.M. & Barabanov, A.F. Origin of the Spin Polaron Quasiparticles and Their Cooper Instability in High-T c Superconductors. J Supercond Nov Magn 29, 1049–1055 (2016). https://doi.org/10.1007/s10948-016-3383-8

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  • DOI: https://doi.org/10.1007/s10948-016-3383-8

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