MEASUREMENTS OF THE AC SUSCEPTIBILITY AND THE SPONTANEOUS RESISTIVE ANISOTROPY IN DILUTE PDFE

The results of detailed measurements of the field and temperature depe ndent ac susceptibility (chi(ac)) and the spontaneous resistive anisot ropy (SRA) of PdFeunderbar samples with between 0.35 and 2.4 at. % Fe are summarized. The chi(ac) data enable estimates for the critical exp onents gamma, beta, and delta to be made, and in the 1.4 at. % sample these are close to Heisenberg model predictions. In the other samples evidence is found for exchange bond disorder. The SRA results are cons istent with this transport coefficient exhibiting critical behavior go verned by percolationlike behavior.