PERTURBED ANGULAR-CORRELATION STUDY OF PD IMPURITY CONFIGURATIONS NEIGHBORING THE CD-111 PROBE ATOM IN CU HOST

The electric field gradients (EFGs) created at the nucleus of 111Cd by Pd impurity atoms in the cubic Cu host are studied by the time differential perturbed angular correlation technique. The observed strong enhancement of near-neighbour (NN) impurity populations to the probe atom permitted the study of the onset of various NN configurations as the impurity concentration was increased from 0.5 to 4.5 at.%. The EFG attributed to one NN Pd impurity agrees very well with NMR data for the same alloy. The temperature dependence of this EFG follows a T3/2 law in the range 80-973K. A measurement at 1173K indicates the presence of dynamical effects on the nuclear quadrupole interaction.