Highly Uniform Magnetic and Electronic Environment in Non-Centrosymmetric Superconductor LaRhGe$_3$

TL;DR

This study uses La-139 NMR to reveal that LaRhGe3, a non-centrosymmetric superconductor, has highly uniform magnetic and electronic environments, is a weakly correlated semimetal, and exhibits type-I superconductivity below 385 mK.

Contribution

First NMR investigation showing the uniformity of magnetic and electronic properties in LaRhGe3, a non-centrosymmetric superconductor with type-I behavior.

Findings

Sharp NMR signals indicating uniform properties

LaRhGe3 is a weakly correlated semimetal

Superconducts below 385 mK as a type-I superconductor

Abstract

We report the results of $^{139}$La NMR measurements in the non-centrosymmetric superconductor LaRhGe$_3$. This material crystallizes in a tetragonal structure without inversion symmetry and exhibits type-I superconductivity below 385 mK. We observed remarkably sharp NMR signals, indicating that the magnetic and electronic properties of the sample are extremely uniform in LaRhGe$_3$ despite the complex crystal structure. Our NMR results indicate that LaRhGe$_3$ is a weakly correlated semimetal in the normal state.