AI 中文总结
研究化学和物理压力对铼基五元高熵合金电子及超导性能的影响，通过对比不同铼浓度合金的性能，发现Tc压力系数随结构变化而变，揭示化学取代和静水压力是调节超导性的互补但不等价途径。
AI 中文摘要
我们报告了一项关于化学压力和物理压力对基于铼的五元高熵合金[Nb0.67-xRex][TiZrHf]0.33（x = 0.10、0.20和0.56）电子和超导性能影响的对比研究。增加铼浓度会使超导转变温度Tc从5.4 K降至3.9 K，同时产生与成分相关的正鸡尾酒效应比率。通过场依赖输运和磁化确定这三种成分都是强II型超导体，x = 0.20是最独特的成分。最重要的是，Tc的压力系数在体心立方 - 六方密堆积结构变化时改变符号。在单一化学相关合金系列中的这种系统对比建立了与结构相关的稳健超导响应，并确定晶体结构是压缩下的关键组织变量。所有三种成分在高达约8 GPa时金属输运和超导性都保持稳健。这些结果表明化学取代和静水压力是调节基于铼的高熵合金超导性的互补但不等价的途径。
英文摘要
We report a comparative study of chemical- and physical-pressure effects on the electronic and superconducting properties of the Re-based quinary high-entropy alloys (HEAs) [Nb0.67-xRex][TiZrHf]0.33 (x = 0.10, 0.20, and 0.56). Increasing Re concentration suppresses the superconducting transition temperature Tc from 5.4 to 3.9 K while producing positive, composition-dependent cocktail-effect ratios. Field-dependent transport and magnetization establish all three compositions as strongly type-II superconductors and identify x = 0.20 as the most distinctive composition, with the largest upper critical field and Ginzburg-Landau parameter and a Maki parameter close to unity. Most importantly, the pressure coefficient of Tc changes sign across the bcc-hcp structural change: dTc/dP is positive for the bcc x = 0.10 and 0.20 samples, with values of approximately 0.018 and 0.053 K/GPa, respectively, but negative for the hcp x = 0.56 sample, with a value of approximately -0.033 K/GPa. This systematic contrast within a single chemically related alloy series establishes a robust structure-associated superconducting response and identifies crystal structure as a key organizing variable under compression. Metallic transport and superconductivity remain robust up to approximately 8 GPa in all three compositions. These results reveal that chemical substitution and hydrostatic compression are complementary but nonequivalent routes for tuning superconductivity in Re-based HEAs.
Comments20 pages, 7 figures
