Investigation of in-plane anisotropy of c-axis magnetoresistance for BiCh2-based layered superconductor NdO0.7F0.3BiS2

We have investigated the in-plane anisotropy of c-axis magnetoresistance (MR) in both superconducting and normal states single crystals NdO0.7F0.3BiS2 under magnetic fields. In NdO0.7F0.3BiS2, four-fold-symmetric MR was observed below transition temperature. Since crystal structure is tetragonal, rotational symmetry state preserved present compound. This result clearly different from previous report LaO0.5F0.5BiSSe crystals, where shows two-fold symmetry. On other hand, symmetric with a small amplitude observed. The possible origin two-fold-symmetric behavior discussed presence local structural disorder conducting plane BiCh2-based compounds.