  (La,Ce)OBiS2 single crystals are successfully grown using CsCl flux. The
obtained single crystals have a plate-like shape with a size of 0.5-2.0 mm and
a well-developed ab-plane. The thickness of the crystals increases with a
decrease in the Ce content. The (La,Ce)OBiS2 single crystals exhibit
superconducting properties. Moreover, the superconducting transition
temperature increases with an increase in the Ce content. The obtained
(La,Ce)OBiS2 single crystals exhibit a tetragonal structure and the valence
state of Ce in the crystals is determined to be mixed with Ce3+ and Ce4+ based
on X-ray absorption fine structure spectroscopy.
