Superconductivity in the Zr-D system under pressure

The superconducting transition temperature T-c of the ZrD0.48 alloy is meas ured in the pressure range up to 41.5 GPa. The measurements are carried out in a high-pressure chamber with diamond anvils by the inductometric method . It is found that T-c(P) increases to 3.1 K at a pressure below 30 GPa, ex hibits a sharp increase up to 8 K near 30 GPa, and then smoothly decreases to similar to 6.5 K at 41.5 GPa. A similar dependence T-c(P) is obtained fo r pure Zr. The similarity of the T-c(P) curves suggests that the dependence T-c(P) observed for ZrD0.48 is due to the presence of omega-phase in this alloy at pressures P < 30 GPa and the omega-beta transition at P approximat e to 30 GPa, which leads to the establishment of new ratios between the pha ses in the Zr-D system. In the pressure range studied, no indications are o bserved for new superconducting phases similar to the phases of intermediat e composition in the Ti-H(D) system, which are formed by the hydrogen trans fer from tetrahedral to octahedral interstitials. (C) 2000 MAIK "Nauka/Inte rperiodica".