Superconductivity of the Ti — D and Zr — D Alloys Under Pressure

The superconducting temperature of the near-eutectoid TiD0.74 and ZrD0.48 alloys is measured in dependence on pressure to 30 and 41.5 GPa, respectively. We find that TiD0.74 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, 7c(0) = 4.0 K, is small compared to the superconducting temperature of the metastable χ-phase earlier obtained after thermobaric treatment, which is indicative of structural inconsistency between the χ- and high-pressure phases. The T c(P) dependence observed on ZrD0.48 is much the same as in pure Zr. The ZrD0.48 superconductivity behavior under pressure is therefore related to the superconducting properties of the high-pressure ω-phase and the ω − s transition under pressure.