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Superconducting high-entropy alloys (HEAs) are a newly burgeoning field ofunconventional superconductors and raise intriguing questions about thepresence of superconductivity in highly disordered systems, which lack regularphonon modes. In our study, we have synthesized and investigated thesuperconducting characteristics of two new transition elements based HEAsRe$_{0.35} $Os$_{0.35} $Mo$_{0.08} $W$_{0.10} $Zr$_{0.12}$ (ReOMWZ)crystallizing in noncentrosymmetric $\alpha$-Mn structure, and Ru$_{0.35}$Os$_{0.35} $Mo$_{0.10} $W$_{0.10} $Zr$_{0.10}$ (RuOMWZ) crystallizinghexagonal closed-packed structure (hcp). Transition metal-based hexagonal hcpHEA is rare and highly desirable for practical applications due to their highhardness. Bulk magnetization, resistivity, and specific heat measurementsconfirmed bulk type-II superconductivity in both alloys. Specific heat analysisup to the measured low-temperature range suffices for a BCS explanation.Comparable upper critical fields with the Pauli paramagnetic limit suggest thepossibility of unconventional superconductivity in both HEAs.

Superconducting properties of new hexagonal and noncentrosymmetric cubic high entropy alloys