Investigation of in-plane anisotropy of c-axis magnetoresistance for BiCh2-based layered superconductor NdO0.7F0.3BiS2
Investigation of in-plane anisotropy of c-axis magnetoresistance for BiCh2-based layered superconductor NdO0.7F0.3BiS2
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DOI：
10.35848/1347-4065/abdc33
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发表时间：
2020-07
影响因子：
1.5
通讯作者：
Kazuhisa Hoshi;K. Sudo;Y. Goto;M. Kimata;Y. Mizuguchi
中科院分区：
文献类型：
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作者：
Kazuhisa Hoshi;K. Sudo;Y. Goto;M. Kimata;Y. Mizuguchi
研究了BiCh_2基（Ch：硫属元素）超导体NdO_（0.7）F_（0.3）BiS_2单晶在超导态和正常态下的c轴磁电阻（MR）的面内各向异性.在NdO_（0.7）F_（0.3）BiS_2的超导态中，在超导转变温度以下，c轴MR的四重对称面内各向异性占主导地位。由于NdO_（0.7）F_（0.3）BiS_2的晶体结构是四重的，所以在本化合物中保持了超导态的旋转对称性。这一结果明显不同于LaO0.5F0.5BiSSe单晶中的情况，其中在超导状态下的面内MR显示出明显的二重对称性，例如超导性。超导态中四重对称和二重对称之间的这些差异可以归因于导电层中的组成元素（有或没有Se）。因此，目前的结果表明，从超导态的非超导态的切换可以实现在BiCh2为基础的系统。还研究了NdO0.7F0.3BiS2的正常态面内各向异性。
We investigated the in-plane anisotropy of the c-axis magnetoresistance (MR) in both superconducting and normal states of the single crystals of a BiCh2-based (Ch: chalcogen) superconductor NdO0.7F0.3BiS2. In the superconducting states of NdO0.7F0.3BiS2, four-fold-symmetric in-plane anisotropy of the c-axis MR was dominant below the superconducting transition temperature. Since the crystal structure of NdO0.7F0.3BiS2 is tetragonal, the rotational symmetry in the superconducting state is preserved in the present compound. This result is clearly different from the cases in LaO0.5F0.5BiSSe single crystals, where the in-plane MR in the superconducting state showed clear two-fold symmetry such as nematic superconductivity. These differences between four-fold and two-fold symmetry in superconducting states could be attributed to constituent elements in the conducting layer (with or without Se). Therefore, the present results propose that switching from nematic to non-nematic superconductivity states could be achieved in the BiCh2-based system. The normal-state in-plane anisotropy was also investigated for NdO0.7F0.3BiS2.