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We have investigated low-temperature crystal structure of BiCh2-basedcompounds LaO1-xFxBiSSe (x = 0, 0.01, 0.02, 0.03, and 0.5), in which anomaloustwo-fold-symmetric in-plane anisotropy of superconducting states has beenobserved for x = 0.5. From synchrotron X-ray diffraction experiments, astructural transition from tetragonal to monoclinic was observed for x = 0 and0.01 at 340 and 240 K, respectively. For x = 0.03, a structural transition andbroadening of the diffraction peak were not observed down to 100 K. These factssuggest that the structural transition could be suppressed by 3% F substitutionin LaO1-xFxBiSSe. Furthermore, the crystal structure for x = 0.5 at 4 K wasexamined by low-temperature (laboratory) X-ray diffraction, which confirmedthat the tetragonal structure is maintained at 4 K for x = 0.5. Our resultssuggest that the two-fold-symmetric in-plane anisotropy of superconductingstates observed for LaO0.5F0.5BiSSe was not originated from structural symmetrylowering.

Structural phase diagram of LaO1-xFxBiSSe: suppression of the structural phase transition by partial F substitutions