Three-Dimensional Multiband d-p Model of Superconductivity in Spin-Chain Ladder Cuprate

TL;DR

This study models superconductivity in a layered cuprate using a three-dimensional multiband d-p model, revealing p_z-wave triplet pairing and its dependence on interlayer coupling and pressure, suggesting ways to enhance superconductivity.

Contribution

It introduces a detailed 3D multiband d-p model for spin-chain ladder cuprates, highlighting the stability of p_z-wave triplet superconductivity and its relation to interlayer coupling and pressure effects.

Findings

p_z-wave triplet superconductivity is most stable.

Superconducting transition temperature depends on interlayer coupling.

Hole transfer from chain to ladder layers influences superconductivity.

Abstract

We study the superconductivity in the three-dimensional multiband d-p model, in which a Cu$_2$O$_3$-ladder layer and a CuO$_2$-chain layer are alternately stacked, as a model of the superconducting spin-chain ladder cuprate. $p_z$-Wave-like triplet superconductivity is found to be the most stable, and its dependence on interlayer coupling can explain the superconducting transition temperature dependence on pressure in real superconducting spin-chain ladder cuprates. The superconductivity may be enhanced if hole transfer from the chain layer to the ladder layer can be promoted beyond the typical transfer rate.