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Re-Nb-Ta-V alloys exhibit superconductivity
Re-Nb-Ta-V alloys, including a medium-entropy formulation of Re0.56Nb0.19Ta0.19V0.06, demonstrate bulk type-II superconductivity.
Researchers at Gdansk University of Technology have synthesized a family of superconducting alloys, including the medium-entropy alloy Re0.56Nb0.19Ta0.19V0.06, that exhibit bulk type-II superconductivity, suggesting a wider range of structurally complex materials could host this property. Pavan Kumar Meena and Tomasz Klimczuk report that alloys of rhenium with vanadium, niobium and tantalum, specifically formulated to remain within the narrow stability range of the σ phase, demonstrate superconductivity despite exhibiting an unconventional negative temperature coefficient in their normal-state resistivity. Transition temperatures determined by electrical resistivity measurements were higher than those found using magnetization…
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