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Recently, two-fold symmetric in-plane anisotropy of the superconductingproperties have been observed in a single crystal of BiCh2-based (Ch: S, Se)layered superconductor LaO0.5F0.5BiSSe having a tetragonal(four-fold-symmetric) in-plane structure; the phenomena are very similar tothose observed in nematic superconductors. To explore the origin of thetwo-fold symmetric anisotropy in the BiCh2-based system, we have investigatedthe electron-doping dependence on the anisotropy by examining the in-planeanisotropy of the magnetoresistance in the superconducting states for a singlecrystal of LaO0.9F0.1BiSSe under high magnetic fields up to 15 T. We observed atwo-fold symmetry of in-plane anisotropy of magnetoresistance forLaO0.9F0.1BiSSe. The results obtained for LaO0.9F0.1BiSSe are quite similar tothose observed for LaO0.5F0.5BiSSe, which has a higher electron dopingconcentration than LaO0.9F0.1BiSSe. Our present finding suggests that theemergence of the in-plane symmetry breaking in the superconducting state isrobust to the carrier concentration in the series of LaO1-xFxBiSSe.

Two-fold symmetry of in-plane magnetoresistance anisotropy in the superconducting states of BiCh2-based LaO0.9F0.1BiSSe single crystal