High-entropy alloy (HEA) superconductors have attracted significant attention due to their exceptional low-temperature mechanical and superconducting properties. We report the synthesis and thorough characterization of an equiatomic HEA superconductor with the composition Sc0.20V0.20Ti0.20Hf0.20Nb0.20, crystallizing in a body-centered cubic crystal structure (Im3m¯). Our investigation, using magnetization, transport, and heat capacity measurements, reveals the presence of weakly coupled, fully gapped superconductivity with a transition temperature of 4.17(3) K and the upper critical field exceeding the Pauli paramagnetic limit. The metallic nature, combined with a high upper critical field, positions it as a promising candidate for applications in superconducting devices.

中文翻译：

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等原子高熵合金 Sc-V-Ti-Hf-Nb 中具有高上临界场的超导性

高熵合金（HEA）超导体由于其优异的低温机械和超导性能而引起了广泛关注。我们报告了等原子 HEA 超导体的合成和全面表征，其成分为 Sc0.20V0.20Ti0.20Hf0.20Nb0.20，以体心立方晶体结构 (Im3m´) 结晶。我们的研究通过磁化、输运和热容测量，揭示了弱耦合、全带隙超导的存在，其转变温度为 4.17(3) K，临界场上限超过泡利顺磁极限。金属性质与高上临界场相结合，使其成为超导器件应用的有希望的候选者。