First single crystal growth and structural analysis of superconducting   layered bismuth oxyselenide; La(O,F)BiSe2
  Single crystal of La(O,F)BiSe2 was successfully grown for the first time by the CsCl flux method. Single crystal X-ray structural analysis clearly showed that La(O,F)BiSe2 crystalizes with space group P4/nmm (lattice parameters a = 4.1408(2) {\AA}, c = 14.1096(6) {\AA}). The structure is composed of alternating BiSe2 and LaO layers. Magnetic susceptibility and resistivity measurements showed the superconducting transition at 3.6 K, which is higher than that of as-grown La(O,F)BiS2. The structural analysis implies that La(O,F)BiSe2 is potential superconductor having higher Tc under high pressure. 
Masashi Tanaka, Masanori Nagao, Yoshitaka Matsushita, Masaya Fujioka,   Saleem J. Denholme, Takahide Yamaguchi, Hiroyuki Tak...
cond-mat.supr-con