Recently, two-fold symmetric in-plane anisotropy of the superconducting properties have been observed in a single crystal of BiCh 2 -based (Ch: S, Se) layered superconductor LaO 0.5 F 0.5 BiSSe having a tetragonal (four-fold-symmetric) in-plane structure; the phenomena are very similar to those observed in nematic superconductors. To explore the origin of the two-fold symmetric anisotropy in the BiCh 2 -based system, we have investigated the electron-doping dependence on the anisotropy by examining the in-plane anisotropy of the magnetoresistance in the superconducting states for a single crystal of LaO 0.9 F 0.1 BiSSe under high magnetic fields up to 15 T. We observed a two-fold symmetry of in-plane anisotropy of magnetoresistance for LaO 0.9 F 0.1 BiSSe. The results obtained for LaO 0.9 F 0.1 BiSSe are quite similar to those observed for LaO 0.5 F 0.5 BiSSe, which has a ...

中文翻译：

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BiCh 2基LaO 0.9 F 0.1 BiSSe单晶在超导态的面内磁阻各向异性的两倍对称性

近来，在具有四方（四重对称）的BiCh 2基（Ch：S，Se）层状超导体LaO 0.5 F 0.5 BiSSe的单晶中，观察到了超对称性的对称的平面对称各向异性的两倍。平面结构；这种现象与向列超导体中观察到的现象非常相似。为了探索BiCh 2基系统中对称对称各向异性的由来，我们通过研究LaO单晶在超导状态下磁阻的面内各向异性来研究电子掺杂对各向异性的依赖性0.9 F 0.1 BiSSe在高达15 T的强磁场下。我们观察到LaO 0.9 F 0.1 BiSSe的磁阻面内各向异性具有两倍对称性。LaO 0.9 F 0.1 BiSSe获得的结果与LaO 0观察到的结果非常相似。