Interaction mechanisms contributing to spin-glass freezing in Au-Cu-Mn alloys

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Abstract
Low-field ac susceptibility measurements on Au-Cu-Mn alloys have been made to determine the spin-glass freezing temperatures as a function of the Au-Cu ratio and the magnetic-atom concentration. The studies reveal that the interaction mechanisms responsible for spin freezing include both mean-free-path and anisotropy effects. A quantitative analysis of the contribution from these two effects has been made for samples with 1 and 8 at. % Mn. For samples with fixed Au and varying Mn concentration, it has been shown that mean-free-path effects account for the change in the freezing temperature. A comparison of our results with pressure studies of the freezing temperature of CuMn has been made.