New layered fluorosulfide SrFBiS2

TL;DR

This paper reports the synthesis and characterization of a new layered fluorosulfide SrFBiS2, revealing its semiconducting properties, low thermal conductivity, and potential as a parent compound for new superconductors.

Contribution

The study introduces a novel layered BiS2-based compound, SrFBiS2, with detailed structural, electrical, and thermal properties, and suggests its potential for superconductivity upon doping.

Findings

SrFBiS2 is a semiconductor with low thermal conductivity.

Experimental results align with first-principles calculations.

SrFBiS2 is similar to LaOBiS2, a known superconductor upon doping.

Abstract

We have synthesized a new layered BiS$_{2}$-based compound SrFBiS2. This compound has similar structure to BiS2. It is built up by stacking up SrF layers and NaCl-type BiS2 layers alternatively along the c axis. Electric transport measurement indicates that SrFBiS2 is a semiconductor. Thermal transport measurement shows that SrFBiS2 has a small thermal conductivity and large Seebeck coefficient. First principle calculations are in agreement with experimental results and show that SrFBiS2 is very similar to LaOBiS2 which becomes superconductor with F doping. Therefore, SrFBiS2 may be a parent compound of new superconductors.