论文标题
基于BICH2的分层超导体NDO0.7F0.3BIS2
Investigation of in-plane anisotropy of c-axis magnetoresistance for BiCh2-based layered superconductor NdO0.7F0.3BiS2
论文作者
论文摘要
我们已经研究了NDO0.7F0.3BIS2在平面内磁场下的超导和正常状态中C轴磁阻（MR）的平面内各向异性。在NDO0.7F0.3BIS2的超导状态下，在超导过渡温度下，观察到C轴MR的四倍对称面内各向异性。由于NDO0.7F0.3BIS2的晶体结构是四方，因此在当前化合物中保留了超导状态中的旋转对称性。该结果显然与LAO0.5F0.5BISSE单晶中观察到的先前报告明显不同，其中超导状态中的平面内MR显示出两倍的对称性。另一方面，在NDO0.7F0.3BIS2的正常状态下，观察到幅度较小的对称MR。在基于BICH2的化合物的传导平面中，讨论了两倍对称行为的可能起源。
We have investigated the in-plane anisotropy of the c-axis magnetoresistance (MR) in both superconducting and normal states of single crystals of NdO0.7F0.3BiS2 under in-plane magnetic fields. In the superconducting states of NdO0.7F0.3BiS2, four-fold-symmetric in-plane anisotropy of the c-axis MR was observed 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 previous report observed in LaO0.5F0.5BiSSe single crystals, where the in-plane MR in the superconducting state shows two-fold symmetry. On the other hand, in the normal states of NdO0.7F0.3BiS2, two-fold symmetric MR with a small amplitude was observed. The possible origin of the two-fold-symmetric behavior was discussed with the presence of local structural disorder in the conducting plane of BiCh2-based compounds.
