Superconducting ground state study of Cr-based equiatomic high-entropy alloy through μ SR

High-entropy alloy superconductors, characterized by extreme chemical disorder and complex electronic environments, have attracted significant attention as model systems for exploring superconductivity in disordered materials. Here, we investigate a Cr-based equiatomic high-entropy alloy, Cr-V-Ti-Nb-Ta, which contains a magnetic 3 d element, providing an opportunity to examine the influence of magnetic elements on superconductivity in highly disordered systems. Despite expected magnetic pair breaking, this alloy exhibits bulk type-II superconductivity with a transition temperature of T c = 2.33 ( 3 ) K and a high upper critical field. Transverse-field μ SR measurements reveal an s -wave superconducting gap close to the BCS value, while zero-field μ SR suggests preserved time-reversal symmetry. These results establish Cr-V-Ti-Nb-Ta as a promising platform for exploring the interplay between disorder, magnetism, and superconductivity in high-entropy alloys.