Superconducting and normal state properties of high entropy alloy Nb-Re-Hf-Zr-Tiinvestigated by muon spin relaxation and rotation

Abstract

Superconducting high entropy alloy (HEA) are emerging as a new class of superconducting materials. It provides a unique opportunity to understand the complex interplay of disorder and superconductivity. We report the synthesis and detail bulk and microscopic characterization of Nb60Re10Zr10Hf10Ti10 HEA alloy using transport, magnetization, specific heat, and muon spin rotation/relaxation (µSR) measurements. Bulk superconductivity with transition temperature TC = 5.7 K confirmed by magnetization, resistivity, and heat capacity measurements. Zero-field µSR measurement shows that the superconducting state preserves time-reversal symmetry, and transverse-field measurements of the superfluid density are well described by an isotropic s-wave model.