# Superconducting Properties and $\mu$SR Study of the Noncentrosymmetric Superconductor Nb$_{0.5}$Os$_{0.5}$

## TL;DR

This study investigates the superconducting properties of Nb$_{0.5}$Os$_{0.5}$, revealing it as a weakly coupled, nodeless s-wave superconductor with preserved time-reversal symmetry, using various experimental techniques.

## Contribution

It provides a comprehensive experimental characterization of Nb$_{0.5}$Os$_{0.5}$, establishing its superconducting nature and symmetry properties for the first time.

## Key findings

- Nb$_{0.5}$Os$_{0.5}$ is a type-II superconductor with $T_c$ = 3.07 K.
- The superconductor exhibits nodeless s-wave pairing symmetry.
- Time-reversal symmetry is preserved in the superconducting state.

## Abstract

The properties of the noncentrosymmetric superconductor ($\alpha$-$\textit{Mn}$ structure) Nb$_{0.5}$Os$_{0.5}$ is investigated using resistivity, magnetization, specific heat, and muon spin relaxation and rotation ($\mu$SR) measurements. These measurements suggest that Nb$_{0.5}$Os$_{0.5}$ is a weakly coupled ($\lambda_{e-ph}$ $\sim$ 0.53) type-II superconductor ($\kappa_{GL}$ $\approx$ 61) having a bulk superconducting transition temperature $T_c$ = 3.07 K. The specific heat data in the superconductive regime fits well with the single-gap BCS model indicating nodeless s-wave superconductivity in Nb$_{0.5}$Os$_{0.5}$. The $\mu$SR measurements also confirm $\textit{s}$-wave superconductivity with the preserved time-reversal symmetry.