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Ferromagnetic and spin-glass ordering has been studied in (Au/sub x/Pd/sub 1-x/)/sub 1-c/Fe/sub c/ alloys for 0 < or = x < or = 1 and 0 < or = c 9 or approx. = 0.06. Magnetic susceptibility, high-field magnetization, and Moessbauer measurements have been performed between liquid-helium and room temperature. For small x, the alloys are strongly exchange enhanced. Assuming that the local-moment--conduction-electron exchange coupling J is independent of x, and employing the Takahashi-Shimizu-Doniach-Wohlfarth theory, we obtain J = 0.12 eV from the saturation moment vs host susceptibility data. The theory, however, fails to describe the interimpurity coupling that leads to magnetic order in the Pd-rich alloys. A simple phenomenological model, based on the ferromagnetic coupling of all the giant polarization clouds except those that are ''isolated,'' gives qualitative agreement with the T/sub C/(c) data, where T/sub C/ is the ordering temperature. The magnetic ordering changes from ferromagnetic to spin glass or mictomagnetic as x increases beyond about 0.5. This seems to be connected with the change at this composition in the character of the electronic states at the Fermi level from d-like to s-like. The Au-rich samples are spin glasses understandable in terms of the Sherrington-Southern theory which is more » based on fluctuations in the exchange couplings of the Fe spins. The magnitude of this coupling was estimated in two ways, employing the theories of Sherrington-Southern and Larkin, and the results were in reasonable agreement with each other. « less

physical review. b, condensed matter

Ferromagnetic and spin-glass ordering in Fe-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Au</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Pd</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>alloys

Ferromagnetic and spin-glass ordering in Fe-dopedAuxPd1−xalloys