Superconductivity in S-substituted FeTe

TL;DR

This paper reports the synthesis of a new superconducting phase in FeTe1-xSx with a simple crystal structure, exhibiting superconductivity around 10 K and promising high upper critical fields, highlighting its potential for applications.

Contribution

It introduces a new superconducting phase of FeTe1-xSx with a simple structure and demonstrates its superconducting properties and potential for practical use.

Findings

Superconducting transition temperature ~10 K at x=0.2

Upper critical field estimated at ~70 T

Material composed of nontoxic elements

Abstract

We have successfully synthesized a new superconducting phase of FeTe1-xSx with a PbO-type structure. It has the simplest crystal structure in iron-based superconductors. Superconducting transition temperature is about 10 K at x = 0.2. The upper critical field Hc2 was estimated to be ~70 T. The coherent length was calculated to be ~2.2 nm. Because FeTe1-xSx is composed of nontoxic elements, this material is a candidate for applications and will activate more and more research on iron-based superconductor.