SUPERCONDUCTIVITY OF THE Ti ― D AND Zr ― D ALLOYS UNDER PRESSURE

摘要

The superconducting temperature of the near-eutectoid TiD_(0.74) and ZrD_(0.48) alloys is measured in dependence on pressure to 30 and 41.5 GPa, respectively. We find that TiD_(0.74) becomes a superconductor at a pressure corresponding to its transformation to the high-pressure phase. The T_c(P) dependence is an increasing function of pressure. The extrapolated to zero pressure value, T_c(0) = 4.0 K, is small compared to the superconducting temperature of the metastable X-phase earlier obtained after thermobaric treatment, which is indicative of structural inconsistency between the X- and high-pressure phases. The T_c(P) dependence observed on ZrD_(0.48) is much the same as in pure Zr. The ZrD_(0.48) superconductivity behavior under pressure is therefore related to the superconducting properties of the high―pressure ω―phase and the ω― β transition under pressure.