Effects of Ferromagnetism and Local Order on Electrical Resistivity of Au-Fe Alloys

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Abstract
The electrical resistivity of a series of Au‐Fe solid solutions, from 4.53 to 40 at. % Fe, has been measured from 1.50° to 350°K. Measurements were made on foils which had been (Q) quenched from 900°C and (A) quenched and subsequently aged at 75°C for 1 week. Results indicate that (1) the general shape of the ρ(T) curves can be explained by a spin‐disorder scattering model for ferromagnetic alloys, (2) changes in the ρ(T) curves on aging are similar to those found in the magnetization and Curie temperature, and (3) alloys of less than 10% Fe exhibit a transition at temperatures similar to those found from Mössbauer measurements. The residual resistivity ρ0 of these alloys goes through a maximum at 12% Fe and decreases for larger concentrations, indicating that all spins are not ferromagnetically ordered. This spin‐disorder contribution to ρ0 decreases when the quenched alloy is aged at 75°C.

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