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We have investigated the in-plane anisotropy of the c-axis magnetoresistance(MR) in both superconducting and normal states of single crystals ofNdO0.7F0.3BiS2 under in-plane magnetic fields. In the superconducting states ofNdO0.7F0.3BiS2, four-fold-symmetric in-plane anisotropy of the c-axis MR wasobserved below the superconducting transition temperature. Since the crystalstructure of NdO0.7F0.3BiS2 is tetragonal, the rotational symmetry in thesuperconducting state is preserved in the present compound. This result isclearly different from the previous report observed in LaO0.5F0.5BiSSe singlecrystals, where the in-plane MR in the superconducting state shows two-foldsymmetry. On the other hand, in the normal states of NdO0.7F0.3BiS2, two-foldsymmetric MR with a small amplitude was observed. The possible origin of thetwo-fold-symmetric behavior was discussed with the presence of local structuraldisorder in the conducting plane of BiCh2-based compounds.

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