New family of noncentrosymmetric (α-Mn) High-Entropy Alloy Superconductors

High-entropy alloys (HEAs) exhibiting superconductivity are of great research interest, as it displays characteristics of both crystalline and amorphous superconductors. In this regard, the particularly interesting case is the recently discovered Re-based α-Mn structure HEAs. These systems are not only the first HEA superconductors based solely on 5d-elements, but they are also isostructural to Re6X (X = Ti, HF, Zr) family of compounds, which famously shows time-reversal symmetry breaking. Here we propose to study the superconducting properties (HfTaWPt) 0.4[Re] 0.6 and (HfNb) 0.1 [MoReRu] 0.9 by a combination of zero-field (ZF) - and transverse-field (TF)-muon measurements and investigate the evidence for an unconventional component of its superconducting order parameter.

具有超导性的高熵合金（High-entropy alloys, HEAs）备受研究关注，因其兼具晶体超导体与非晶超导体的特征。在此背景下，近期发现的铼基α-Mn结构高熵合金尤为引人关注。这类体系不仅是首个完全基于5d族元素的高熵合金超导体，还与以时间反演对称性破缺著称的Re₆X（X=Ti、HF、Zr）化合物家族同构。本研究拟通过零场（zero-field, ZF）与横向场（transverse-field, TF）μ子测量相结合的方法，研究（HfTaWPt）₀.₄[Re]₀.₆和（HfNb）₀.₁[MoReRu]₀.₉的超导特性，并探究其超导序参量中非常规分量的存在证据。