BCS-BEC model of high-Tc superconductivity in layered cuprates with unconventional pairing

TL;DR

This paper presents a BCS-BEC model for high-Tc superconductivity in layered cuprates, deriving a formula for Tc that aligns well with experimental data across various compounds.

Contribution

It introduces a novel BCS-BEC formalism with linearly-dispersive pairs in quasi-2D layers, providing a predictive Tc formula for layered cuprates.

Findings

The Tc formula matches empirical values for seven cuprate compounds.

Layer width, Debye frequency, pairing energy, and penetration depth determine Tc.

The model offers a unified explanation for high-Tc superconductivity in layered cuprates.

Abstract

High-Tc superconductivity in layered cuprates is described in a BCS-BEC formalism with linearly-dispersive s- and d-wave Cooper pairs moving in quasi-2D finite-width layers about the CuO_2 planes. This yields a closed formula for Tc determined by the layer width, the Debye frequency, the pairing energy, and the in-plane penetration depth. The new formula reasonably reproduces empirical values of superconducting Tc's for seven different compounds among the LSCO, YBCO, BSCCO and TBCCO layered cuprates.