Pressure Dependence of the Superconducting Transition Temperature of (Th/sub 1-X/Y/sub X/)Rh sub 4 B sub 4

摘要

The pressure dependence of the superconducting transition temperatures, T/sub c/'s, of fourteen samples in the pseudoternary system (Th/sub 1-x/Y/sub x/)Rh sub 4 B sub 4 are reported for hydrostatic pressures up to 21 kbar. The Y rich samples show an enhancement of T/sub c/ with applied pressure, whereas for the Th rich compounds T/sub c/ is depressed by pressure. A broad plateau in dT/sub c//dp as a function of x is observed for nearly equiatomic (0.4 less than or equal to x less than or equal to 0.80) compositions. The non-linear behavior of T/sub c/ as a function of pressure for the Y rich samples (x > 0.80) is discussed with reference to prior measurements on YRh sub 4 B sub 4 . Observation of this non-linearity may be related to the purity of the Y source material or the presence of a pressure-induced phase transformation. (ERA citation 05:035160)