Optimal T$_c$ of cuprates: role of screening and reservoir layers

TL;DR

This paper investigates how charge reservoir layers with effective dielectric screening can significantly enhance the superconducting transition temperature in cuprates, providing insights into optimizing T$_c$ in unconventional superconductors.

Contribution

It introduces a theoretical framework highlighting the impact of short-distance dielectric screening from reservoir layers on T$_c$ in cuprates.

Findings

Dielectric screening at short distances can enhance T$_c$.

Coupling of reservoir layers influences superconducting properties.

Qualitative arguments extend to other unconventional superconductors.

Abstract

We explore the role of charge reservoir layers (CRLs) on the superconducting transition temperature of cuprate superconductors. Specifically, we study the effect of CRLs with efficient short distance dielectric screening coupled capacitively to copper oxide metallic layers. We argue that dielectric screening at short distances and at frequencies of the order of the superconducting gap, but small compared to the Fermi energy can significantly enhance T$_c$, the transition temperature of an unconventional superconductor. We discuss the relevance of our qualitative arguments to a broader class of unconventional superconductors.