Spin-polaron concept in the theory of normal and superconducting states of cuprates
A.F. Barabanov*c aKirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Academgorodok 50, str. 38, Krasnoyarsk, 660036, Russian Federation bM. F. Reshetnev Siberian State University of Science and Technologies, Krasnoyarsky Rabochy Av. 31, Krasnoyarsk, 660014, Russian Federation cInstitute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation
The review discusses the emergence of the spin-fermion model of cuprates and the formation of the spin-polaron concept of the electronic structure of hole-doped cuprate superconductors. This concept has allowed describing the properties of cuprates in the normal phase as well as the features of superconducting pairing in the unified approach. The derivation of the spin-fermion model from the Emery model in the regime of strong electronic correlations is described, demonstrating the appearance of strong coupling between the spins of copper ions and holes on oxygen ions. Such a strong interaction against the background of the singlet state of the spin subsystem of copper ions (quantum spin liquid) leads to the formation of special Fermi quasiparticles — nonlocal spin polarons. Under doping, the spin-polaron ensemble exhibits instability with respect to superconducting d-wave pairing, whereas superconducting s-wave pairing is not implemented. At the optimal doping, the transition to the superconducting phase occurs at temperatures corresponding to experimental data. It is shown that the superconducting d-wave pairing of spin-polaron quasiparticles is not suppressed by the Coulomb repulsion of holes located on neighboring oxygen ions. It is emphasized that, when the spectral characteristics of spin-polaron quasiparticles are taken into account, the calculated temperature and doping dependences of the London penetration depth are in good agreement with experimental data.
Keywords: strongly correlated electron systems, high-temperature superconductivity, spin polarons, intersite Coulomb interaction, London penetration depth PACS:71.10.−w, 71.10.Fd, 71.27.+a, 74.20.−z, 74.20.Mn, 74.25.N−, 74.72.−h (all) DOI:10.3367/UFNe.2020.08.038829 URL: https://ufn.ru/en/articles/2021/7/a/ Citation: Val’kov V V, Dzebisashvili D M, Korovushkin M M, Barabanov A F "Spin-polaron concept in the theory of normal and superconducting states of cuprates" Phys. Usp.64 641–670 (2021)