Superconductivity inBaPb1−xBixO3near the metal-semiconductor phase boundary under pressure

Abstract

The resistance of Ba${\mathrm{Pb}}_{0.8}$ ${\mathrm{Bi}}_{0.2}$ ${\mathrm{O}}_3$ has been measured as a function of temperature at various pressures. The results show that the compound is made more semiconductorlike by the application of pressure, while its superconducting transition temperature is enhanced before a phase transition, evidenced by a resistance jump, sets in.