New Layered Fluorosulfide SrFBiS₂

Abstract

We have synthesized a new layered BiS₂-based compound, SrFBiS₂. This compound has a similar structure to LaOBiS₂. It is built up by stacking up SrF layers and NaCl-type BiS₂ layers alternatively along the <i>c</i> 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 a superconductor with F doping. Therefore, SrFBiS₂ may be a parent compound of new superconductors