MAGNETIC SUSCEPTIBILITY OF DILUTE PD(RH AND PD(AG) ALLOYS

High-resolution measurements of magnetic susceptibility χ of dilute alloys of Pd1-aRha (a = 0.001, 0.075, 0.015, 0.03, and 0.07) and Pd1-aAga (a = 0.001, 0.005, 0.012, 0.023, and 0.025) are presented for temperatures from 4.2° to 300°K and for fields up to 55 kG. The general features show a broad maximum of χ(4.2°K) between 0.03 Rh and 0.07 Rh for Pd(Rh), then a rapid decrease in χ(4.2°K) to the value of χ for pure Pd, and a further decrease of χ with increasing Ag content. Small effects of Fe impurities are noted and briefly discussed. The very rapid variation of χ versus Rh content is consistent with earlier measurements. The maximum of χ(T), observed at about 80°K for pure Pd, moves toward 0°K as Rh content increases to 0.03, but the maximum in χ(T) is almost independent of increasing Ag content. The measured susceptibility and electronic specific heat are used to estimate the Stoner exchange enhancement in Pd and Pd0.95Rh0.05 and the results are in reasonable agreement with independent high-field results discussed elsewhere. The relevance of recent high-resolution band calculations is briefly discussed. Finally, for simplicity, a rigid band model and the χ(4.2°K) data for the Pd(Rh) and Pd(Ag) alloys are employed to construct the density of states versus energy for Pd. © 1969 The American Institute of Physics.