High-temperature superconductivity and normal state in the Holstein-t-J model

TL;DR

This paper investigates how electron-phonon interactions influence high-temperature superconductivity in cuprates within the Holstein-t-J model, showing that polaron effects can explain experimental observations.

Contribution

It introduces a detailed analysis of Holstein polaron effects on superconductivity in the t-J model, aligning theoretical results with experimental data.

Findings

Calculated critical temperature matches experimental data.

Polaron excitations significantly affect superconducting properties.

Electron pairing is influenced by electron-phonon interactions.

Abstract

A possible origin of the high-temprature superconductivity in cuprates has been suggested. It is supposed that electron-phonon interaction determines the strong correlation narrowing of the electron band. It provides the conditions for the formation of a singlet electron pair coupled by exchange interaction. For the pure t-J model it has been proved that these electron pairs are destroyed by a strong effective kinematic field. The detailed analysis of an influence of the Holstein polaron excitations upon normal and superconducting properties of the strongly correlated electrons was made. A calculated critical temperature of the superconductivity and gap function are in good agreement with experimental data for cuprates.