Superconducting and normal-state properties of the high-entropy alloy Nb-Re-Hf-Zr-Ti investigated by muon spin relaxation and rotation
Kapil Motla, P. K. Meena, Arushi, D. Singh, Piyali Biswas, A. D. Hillier, R. P. Singh
Abstract
Superconducting high entropy alloys (HEAs) are emerging as an exotic class of superconducting materials, providing a unique opportunity to understand the complex interplay of disorder and superconductivity. We report the synthesis and detail bulk and microscopic characterization of a ${\mathrm{Nb}}_{60}{\mathrm{Re}}_{10}{\mathrm{Zr}}_{10}{\mathrm{Hf}}_{10}{\mathrm{Ti}}_{10}$ HEA alloy using transport, magnetization, specific heat, and muon spin rotation/relaxation ($\ensuremath{\mu}\mathrm{SR}$) measurements. Bulk superconductivity with transition temperature ${T}_{C}=5.7$ K is confirmed by magnetization, resistivity, and heat capacity measurements. Zero-field $\ensuremath{\mu}\mathrm{SR}$ measurements confirm that the superconducting state preserves time-reversal symmetry, and transverse-field measurements show that the superfluid density is well described by an isotropic $s$-wave model.