Chemical Substitution and High Pressure Effects on Superconductors in the $Ln$OBiS$_{2}$ ($Ln$ = La-Nd) System

TL;DR

This paper reviews recent progress on how chemical substitution and high pressure influence the structure and superconductivity of LnOBiS2 compounds, highlighting strategies to optimize their superconducting properties.

Contribution

It provides a comprehensive review of chemical substitution effects and high pressure on LnOBiS2 superconductors, emphasizing structure-property relationships and optimization strategies.

Findings

Chemical substitution can enhance superconductivity in LnOBiS2 compounds.

High pressure modifies lattice parameters and electronic structures.

Strategies for optimizing superconductivity are discussed.

Abstract

A large number of compounds which contain BiS$_{2}$ layers exhibit enhanced superconductivity upon electron doping. Much interest and research effort has been focused on BiS$_{2}$-based compounds which provide new opportunities for exploring the nature of superconductivity. Important to the study of BiS$_{2}$-based superconductors is the relation between structure and superconductivity. By modifying either the superconducting BiS$_2$ layers or the blocking layers in these layered compounds, one can effectively tune the lattice parameters, local atomic environment, electronic structure, and other physical properties of these materials. In this article, we will review some of the recent progress on research of the effects of chemical substitution in BiS$_{2}$-based compounds, with special attention given to the compounds in the $Ln$OBiS$_{2}$ ($Ln$ = La-Nd) system. Strategies which are reported to be essential in optimizing superconductivity of these materials will also be discussed.