NMR Characterization of Sulphur Substitution Effects in the K(x)Fe(2-y)Se(2-z)S(z) high Tc Superconductor

TL;DR

This study uses NMR techniques to investigate how sulfur substitution affects the electronic and magnetic properties of the high-temperature superconductor K(x)Fe(2-y)Se(2-z)S(z), providing insights into its superconducting behavior.

Contribution

It offers new NMR data on sulfur-substituted KFeSe superconductors, revealing the impact of S substitution on their electronic properties compared to the non-substituted system.

Findings

S substitution alters the Knight shift and relaxation rates

Electronic properties are affected by sulfur content

Comparison with non-substituted system highlights substitution effects

Abstract

We present an NMR study of the effect of S substitution in the high Tc superconductor K(x)Fe(2-y)Se(2-z)S(z) in a temperature range up to 250 K. We present NMR Knight shift and nuclear spin-lattice relaxation rate 1/T1 data, and compare our results to that of the non-substituted system K(x)Fe(2-y)Se(2).