Bi2Sr2-xLnxCuOy (Ln=Nd, Sm) was synthesized in the range of x=0.2-0.6 and a single phase was obtained in the range of x=0.3-0.6. A diamagnetic signal was observed for x=0.2-0.6 and the maximum Tc of 23 K for Nd3+ and 17 K for Sm3+ was obtained around x=0.5 and 0.4, respectively. Single crystals of Bi2Sr2-xLnxCuOy (Ln = Nd, Sm) were successfully grown by the self-flux method from the melt of stoichiometric composition. DTA was used to determine the thermal cycle. The as-grown crystal from the melt of Bi2Sr1.6Nd0.4CuOy was Bi2Sr1.6Nd0.4CuOy with dimensions over 2mm and exhibited superconductivity at Tc∼20K. The crystal growth of Bi2Sr2-xSmxCuOy was examined for the stoichiometric melt of Bi2Sr1.5Sm0.5CuOy. However, we could not observe single crystal with 2 2 0 1 structure. The crystal had 2 2 1 2 structure and showed no superconductivity.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry