Single-Crystal Growth and Characterization of Cuprate Superconductor (Hg,Re)Ba₂Ca₂Cu₃O₈₊δ

We grew (Hg,Re)Ba2Ca2Cu3O8+δ ((Hg,Re)1223) single crystals with good reproducibility via the single-step flux method using monoxides as raw materials.A double-sealing method using a thickwalled quartz tube and a stainless-steel container was adopted for explosion protection.The maximum crystal size was approximately 1 mm × 1 mm in the ab plane and 0.04 mm in thickness.The crystal was square-shaped, reflecting the tetragonal crystal structure of (Hg,Re)1223.Magnetic susceptibility measurements indicated a critical temperature of 130 K.The in-plane resistivity exhibited a linear temperature dependence, indicating that the sample was close to optimal doping level.The out-of-plane resistivity was also measured, and the anisotropy parameter was 250-650 at 300 K.