标题： 具有非中心对称$α$-Mn 晶格的中熵/高熵 Re 基合金中的超导性 显示英文标题

标题： Superconductivity in the Medium-Entropy/High-Entropy Re-based Alloys with a Non-Centrosymmetric $α$-Mn Lattice

摘要： 中高熵合金（MEA-HEAs）和基于铼的非中心对称（NC）结构化合物因其在探索非常规超导性方面的潜力而备受关注。 在此，成功合成了五种以前未报道过的基于铼的NC MEA-HEA超导体，其晶体结构为$\alpha$-Mn 晶格，超导转变温度（Tcs）范围在4到5开尔文之间。通过成分调整来调节价电子计数（VEC），可以提高超导转变温度（Tc）。 磁化测量结果确认，所有合成的基于铼的MEA-HEA均为体材料II型超导体。 比热分析表明，这些HEA的超导态可以用单一间隙s波模型很好地描述。 我们的研究结果显示，这些$\alpha$-Mn MEA/HEA超导体的Kadowaki-Woods比率接近重费米子化合物的典型值，这表明存在强烈的电子关联。 这些发现为研究高无序度在NC MEA-HEAs超导起源中的作用提供了有前景的材料平台。 显示英文摘要

摘要： Medium or high-entropy alloys (MEAs-HEAs) and rhenium-based compounds with a non-centrosymmetric (NC) structure have received a lot of attention for offering a fertile soil in search for unconventional superconductivity. Here, five previously unreported NC Re-based MEA-HEA superconductors with an $\alpha$-Mn lattice are successfully synthesized, with their superconducting transition temperatures (Tcs) ranging from 4 to 5 K. An increase in the superconducting transition temperature (Tc) can be achieved by modulating the valence electron count (VEC) through compositional adjustments. Magnetization measurements confirm that all the synthesized Re-based MEA-HEAs are bulk type-II superconductors. Specific heat analysis reveals that the superconducting state of these HEAs can be well described by a single-gap s-wave model. Our results show that the Kadowaki-Woods ratio of these $\alpha$-Mn MEA/HEA superconductors are close to the typical value of heavy fermion compounds, suggesting the existence of strong electronic correlation. These findings provide promising material platforms to study the role of high disorder in the origin of superconductivity in the NC MEAs-HEAs.