Pressure effect on superconducting transition-temperature relaxation behavior of theZr70Cu30amorphous alloy on annealing at elevated pressures

The superconducting transition-temperature ($T_c$) relaxation behavior of ${\mathrm{Zr}}_{70}$ ${\mathrm{Cu}}_{30}$ Metglas upon annealing at pressures up to 2.5 GPa is investigated. Our results show that although compression generally retards the relaxation process, it also oppositely influences atomic activation processes in $T_c$ relaxation at the lower and higher sides of an appropriate pressure. A homogenization in amorphous structure induced by this pressure is suggested to be responsible for the above behavior.