Two-fold symmetry of in-plane magnetoresistance anisotropy in the superconducting states of BiCh2-based LaO0.9F0.1BiSSe single crystal
Two-fold symmetry of in-plane magnetoresistance anisotropy in the superconducting states of BiCh2-based LaO0.9F0.1BiSSe single crystal
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DOI：
10.1088/2399-6528/abbb58
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发表时间：
2020-09-01
影响因子：
1.2
通讯作者：
Mizuguchi, Yoshikazu
中科院分区：
文献类型：
--
作者：
Hoshi, Kazuhisa;Kimata, Motoi;Mizuguchi, Yoshikazu
最近，在具有四重对称（four-fold-symmetric）面内结构的BiCh（2）基（Ch：S，Se）层状超导体LaO 0.5F 0.5BiSSe单晶中观察到了超导性质的二重对称面内各向异性;该现象与在BiCl 2超导体中观察到的现象非常相似。为了探索BiCl 2（2）基系统中双重对称各向异性的起源，我们通过研究LaO0.9F0.1BiSSe单晶在高达15 T的强磁场下超导态的磁阻的面内各向异性，研究了电子掺杂对各向异性的依赖性.我们观察到一个二重对称性的面内各向异性的磁电阻LaO 0.9F0.1BiSSe。对于LaO0.9F0.1BiSSe获得的结果与对于LaO0.5F0.5BiSSe观察到的结果非常相似，LaO0.5F0.5BiSSe具有比LaO0.9F0.1BiSSe更高的电子掺杂浓度。我们目前的研究结果表明，出现在超导态的面内对称性破缺是强大的LaO 1-xFxBiSSe系列中的载流子浓度。
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 LaO0.5F0.5BiSSe 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 LaO0.9F0.1BiSSe under high magnetic fields up to 15 T. We observed a two-fold symmetry of in-plane anisotropy of magnetoresistance for LaO0.9F0.1BiSSe. The results obtained for LaO0.9F0.1BiSSe are quite similar to those observed for LaO0.5F0.5BiSSe, which has a higher electron doping concentration than LaO0.9F0.1BiSSe. Our present finding suggests that the emergence of the in-plane symmetry breaking in the superconducting state is robust to the carrier concentration in the series of LaO1-xFxBiSSe.