  Sb-substituted CeOBiS2 single crystals with 0.2-1.0 mm size have been
successfully grown using CsCl/KCl flux. Sb substitution strongly suppressed the
superconductivity in CeOBiS2, and the substitution of more than approximately 4
atomic percent in Bi-site disappeared the superconductivity at a measurement
range of above 0.36 K. Furthermore, the drastic change of c-axis lattice
parameter was observed in a neighborhood to Sb substitution amount, which maybe
suggests the structural transition in CeOBiS2. The Ce valence state of the
obtained single crystals was evaluated. However, the established correlations
between Ce valence state and superconductivity could not be revealed.
