High-Pressure Synthesis of CuBa2Ca3Cu4O10+δ Superconductor from Precursors Prepared by a Polymerized Complex Method

Abstract

Samples of a CuBa2Ca3Cu4O10+δ superconductor were synthesized under a high pressure of 5 GPa at 1100–1200 °C for 30 min using precursors produced by solid-state reaction and polymerized complex methods. Compared with the precursors prepared by the solid-state reaction method, the precursors produced by the polymerized complex method have low grain sizes. The superconductive transition temperature of the samples prepared using precursors made by the polymerized complex method was found to be 113 K. The volume fractions of the superconducting phase in the samples prepared using precursors made by the solid-state reaction and polymerized complex methods were 49 and 36%, respectively. From these results, precursors made by the polymerized complex method can be used in the high-pressure synthesis of superconductors similarly to those made by the solid-state reaction method.