Superconductivity of Cd₂Re₂O₇ under Pressure

Abstract

Electrical resistivity measurements of Cd₂Re₂O₇ under pressure and magnetic field have been performed. The two superconducting transitions previously observed under pressure become one under a magnetic field of 0.2 T. The superconductivity transition temperature T_c increases linearly from 1 K to 2.4 K with increasing pressure up to 2.4 GPa in the field. The upper critical field H_c2 observed by measurements of the field dependence of electrical resistivity under pressure increases to about 4T with increasing pressure up to 2.4 GPa. The Grüneisen parameters of T_c, H_c2, and T_s are estimated to be 96, 243, and −32, respectively.