Superconductivity of Cd2Re2O7 under pressure

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, increases linearly from I K to 2.4 K with increasing pressure up to 2.4 GPa in the field. The upper critical field H,2 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 Gruneisen parameters of T-c, H-c2, and T-s, are estimated to be 96, 243, and -32, respectively.