Effect of chemical substitution in Rh17S15

TL;DR

This study investigates how substituting different elements in Rh17S15 affects its superconducting properties, revealing that certain dopants suppress superconductivity and alter electron correlations, with some inducing magnetic order.

Contribution

It provides new insights into how chemical substitution influences superconductivity and electron correlations in Rh17S15, highlighting the effects of specific dopants.

Findings

Ir and Se substitution lower Tc significantly

Fe, Pd, Ni doping suppresses superconductivity below 1.5 K

Fe doping suggests possible antiferromagnetic order

Abstract

Rh17S15 has recently been shown to be a strongly correlated superconductor with a transition temperature of 5.4 K. In order to understand the nature of strong correlations we study the effect of substitution of some of the Rh and S atoms by other elements such as Fe, Pd, Ir and Ni on the Rh side and Se on the S side in this work. We find that while substitution of Ir and Se lower the transition temperature considerably, that of Fe, Pd and Ni destroy superconductivity down to 1.5 K. The resistivity data in these doped samples show a minimum which is presumably disorder induced. A reduction of Tc is always accompanied by a reduction of electron correlations as deduced from heat capacity and magnetization data. Interestingly, the Fe doped sample shows some possible antiferromagnetic ordering at low temperatures.