Uniform electronic states and $s$-wave superconductivity in a strongly disordered high-entropy compound (RuRhPdIr)$_{0.6}$Pt$_{0.4}$Sb

TL;DR

This study reveals that a highly disordered high-entropy superconductor maintains uniform electronic states and exhibits conventional s-wave superconductivity, challenging the expectation that disorder disrupts such properties.

Contribution

It provides the first detailed nuclear magnetic resonance evidence of homogeneous electronic states and s-wave pairing in a strongly disordered high-entropy superconductor.

Findings

Homogeneous electronic environment in the normal state.

Observation of a Hebel-Slichter coherence peak.

Evidence for fully gapped s-wave superconductivity.

Abstract

High-entropy compounds, where multiple elements occupy a single crystallographic site in a highly disordered manner, challenge conventional understandings of electronic structure based on periodicity and well-defined band dispersion. Here, we report a detailed nuclear magnetic resonance study of the high-entropy superconductor (RuRhPdIr)$_{0.6}$Pt$_{0.4}$Sb, revealing a spatially homogeneous electronic environment in the normal state, in stark contrast to its crystallographically disordered lattice. The superconducting state exhibits a small but solid Hebel-Slichter coherence peak followed by a significant decrease in the nuclear spin-lattice relaxation rate, providing compelling evidence for fully gapped $s$-wave pairing. Our findings not only deepen the understanding of superconductivity in highly disordered quantum materials but also open a new pathway for exploring novel superconducting states in entropy-stabilized systems.