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

Abstract

The properties of the noncentrosymmetric superconductor ($\alpha$-$\text{Mn}$ 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 $\text{s}$-wave superconductivity with the preserved time-reversal symmetry.

7 Page, 8 Figures

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