Influence of the Coulomb Repulsions on the Formation of the Superconducting Gap of the Spin-Polaron Quasiparticles in Cuprates

Вальков, В. В.; Korovushkin, M. M.; Барабанов, А. Ф.

doi:10.1007/s10909-018-02120-3

Cited by 3 publications

(1 citation statement)

References 23 publications

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“…The noted advantages of the SFM manifested themselves clearly in the study of both the normal [28][29][30] and superconducting phases [31][32][33][34] of cuprates. The most important result was the solution [32] of the longstanding problem of stability of the superconducting d-wave pairing with respect to the intersite Coulomb interaction between holes on the nearest oxygen ions.…”

Section: Introductionmentioning

confidence: 97%

Electrical resistivity and the Hall effect in the doped Mott-Hubbard material with strong spin-charge coupling

Korovushkin

2023

Phys. Scr.

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The kinetic characteristics of the doped Mott-Hubbard material are considered within the realistic spin-fermion model which takes into account the strong spin-charge coupling. The kinetic equation constructed on the basis of the mechanism of carrier scattering on the spin fluctuations is solved using the multi-moment method, which allows one to analyze the temperature behavior of nonequilibrium distribution function in the problems of electrical resistivity ρ and the Hall coefficient R H . The calculated dependences ρ(T) and R H (T) for the underdoped and optimally doped regimes demonstrate good qualitative agreement with the experimental data. In particular, the Hall coefficient calculated for the underdoped regime reproduces the experimentally observed sharp drop and even a change in sign at low temperatures.

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Section: Introductionmentioning

confidence: 97%

Electrical resistivity and the Hall effect in the doped Mott-Hubbard material with strong spin-charge coupling

Korovushkin

2023

Phys. Scr.

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Strong Spin–Charge Coupling and Its Manifestation in the Quasiparticle Structure, Cooper Instability, and Electromagnetic Properties of Cuprates

Вальков

Dzembisashvili

Korovushkin

et al. 2019

J. Exp. Theor. Phys.

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Spin-polaron concept in the theory of normal and superconducting states of cuprates

Вальков¹,

Dzebisashvili²,

Korovushkin³

et al. 2021

Phys.-Usp.

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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 spec-tral 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.

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Influence of the Coulomb Repulsions on the Formation of the Superconducting Gap of the Spin-Polaron Quasiparticles in Cuprates

Cited by 3 publications

References 23 publications

Electrical resistivity and the Hall effect in the doped Mott-Hubbard material with strong spin-charge coupling

Electrical resistivity and the Hall effect in the doped Mott-Hubbard material with strong spin-charge coupling

Strong Spin–Charge Coupling and Its Manifestation in the Quasiparticle Structure, Cooper Instability, and Electromagnetic Properties of Cuprates

Spin-polaron concept in the theory of normal and superconducting states of cuprates

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