Effect of aging on the magnetoresistance and AC susceptibility of the spin glass Au-8 at.% Mn

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Abstract
The authors have measured the low-field magnetoresistance from 4.2-77K and the AC susceptibility between 4.2 and 300K in Au-8 at.% Mn as a function of aging. Most of the aging occurs during the first three days at 300K. The relationship between magnetoresistance and magnetisation as a function of temperature and age has been examined and the authors have found the magnetisation squared expression to be invalid under very low field conditions. From studies of the in-phase and quadrature components of the AC susceptibility, the alloy fails: (a) to give a physically meaningful distribution of blocking temperatures function; and (b) to adhere to the predictions of a simple cluster model incorporating cluster interactions.
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