Pressure Effects on Structure and T_c in Superconducting PrBa₂Cu₃O_x

抄録

The pressure dependence of T_c of superconducting PrBa₂Cu₃O_x was studied by electrical resistance measurements under hydrostatic pressure up to 10 GPa. A large positive pressure coefficient of T_c, dT_c/dP, with a maximum of 7. 3K/GPa, was observed. The coefficient was found to vary with the oxygen content of the compounds, in a similar manner as the isostructural YBa₂Cu₃O_x compound behaves. The present research revealed an opposite pressure effect on T_c with those reported for the Pr-substituted Y-Ba-Cu-O compounds with high Pr concentration.