Variation of Superconducting Transition Temperature in Hole-Doped Copper-Oxides

TL;DR

This paper investigates how variations in interlayer coupling and next nearest neighbor hopping influence the maximum superconducting transition temperature in hole-doped cuprates, offering insights for discovering new high-$T_c$ materials.

Contribution

It introduces an extended interlayer coupling model that explains the differences in $T_c$ among cuprate series and compounds, highlighting the roles of $t'$ and interlayer pairing.

Findings

Maximum $T_c$ variation is linked to next nearest neighbor hopping $t'$.

Differences in $T_c$ among compounds are governed by interlayer pairing strength.

Model provides guidelines for designing new high-$T_c$ superconductors.

Abstract

The experimentally observed difference of superconducting critical temperature $T_{c}$ in hole-doped cuprates is studied by using an extended interlayer coupling model for layered d-wave superconductors. We show that the change of the maximum $T_{c}$ from series to series is determined by the next nearest neighboring hopping $t^{\prime}$, while the difference of the maximum $T_{c}$ among the compounds in a homogeneous series is controlled by the interlayer pairing strength. Our results provide helpful guidelines in the search for new high-$T_{c}$ superconductors.