2009 年 19 巻 2 号 p. 113-118
In the first half of this article, the new material search for FeX4 (X=pnictogen, chalcogen) based superconductors is introduced and the new method to grow single crystals for Fe-based superconductors and related materials are also described. Using a high-pressure apparatus, we report the single crystal growth of Fe-based superconductors and related materials (BaFe2As2, SrFe2As2, (Ba, Na)Fe2As2 and α-PbO type FeSe0.9 superconductor, BaNi2P2). Especially, we have grown single crystals of BaNi2P2 superconductors from stoichiometric composition solutions for the first time. The temperature dependence of in-plane (r//) and out-of-plane (r⊥) resistivity for BaNi2P2 crystals were measured, the anisotropy ratio r⊥/r// is ~6.3 at 300 K, and sharp superconducting transition was observed at ~2.5 K.