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Re 1−x Mo x as an ideal test case of time-reversal symmetry breaking in unconventional superconductors
npj Quantum Materials ( IF 5.7 ) Pub Date : 2020-10-30 , DOI: 10.1038/s41535-020-00279-1
Tian Shang , Christopher Baines , Lieh-Jeng Chang , Dariusz Jakub Gawryluk , Ekaterina Pomjakushina , Ming Shi , Marisa Medarde , Toni Shiroka

Non-centrosymmetric superconductors (NCSCs) are promising candidates in the search for unconventional and topological superconductivity. The α-Mn-type rhenium-based alloys represent excellent examples of NCSCs, where spontaneous magnetic fields, peculiar to time-reversal symmetry (TRS) breaking, have been shown to develop in the superconducting phase. By converse, TRS is preserved in many other isostructural NCSCs, thus leaving the key question about its origin fully open. Here, we consider the superconducting Re1−xMox (0 ≤ x ≤ 1) family, which comprises both centro- and non-centrosymmetric structures and includes also two extra superconducting phases, β-CrFe and bcc-W. Muon-spin relaxation and rotation (μSR) measurements show a gradual increase of the relaxation rate below Tc, yet its independence of the crystal structure, suggesting that rhenium presence and its amount are among the key factors for the appearance and the extent of TRS breaking in the α-Mn-type NCSCs. The reported results propose Re1−xMox as an ideal test case for investigating TRS breaking in unconventional superconductors.



中文翻译:

Re 1-x Mo x作为非常规超导体中时间反转对称破坏的理想测试案例

非中心对称超导体(NCSC)是寻求非常规和拓扑超导性的有希望的候选者。所述α -Mn型的基于铼的合金表示NCSCs,其中自发磁场,特有的断裂时间反转对称性(TRS),已经显示出在超导相发展的很好的例子。相反,TRS被保留在许多其他同构的NCSC中,因此,关于其起源的关键问题完全没有解决。这里,我们考虑超导重新1- XX(0≤  X  ≤1)家族,其包括既centro-和非中心对称的结构,并且还包括两个额外的超导相,β-CrFe和bcc-W。Muon-spin弛豫和旋转(μSR)测量表明,在T c以下,弛豫速率逐渐增加,但其晶体结构的独立性,表明rh的存在及其含量是影响外观和范围的关键因素。 TRS在α -Mn型NCSC中断裂。报告的结果提出Re 1- x Mo x是研究非常规超导体TRS断裂的理想测试案例。

更新日期:2020-10-30
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