A comparison of the systematics of the spin-glass susceptibility peaks in P d Mn with an effective-field model

Abstract

We present new measurements of the ac susceptibility of two PdMn alloys containing 5.0 and 5.5 at. % Mn in approximately 50 static biasing fields up to 1 kOe, as well as a survey of previous data on more concentrated samples, in an attempt to establish the details of the field suppression of the spin‐glass peaks in this system. These results are compared with the predictions of an arbitrary spin effective‐field model. Both the experimental data and the theoretical predictions indicate that the rate of this suppression increases dramatically as one approaches the ferromagnetic–spin‐glass critical point (i.e., as η=J̄₀/J̄→1, where J̄₀ and J̄ refer to the center and width of the exchange distribution).