Abstract
The ESR of the spin glassAgMn (2.7 and 9.6 at %) has been investigated below and aboveT g(0.1T g<T<5T g) at various microwave frequencies. The analysis yields:1) No explicit frequency dependence but strong magnetic field effects, inherent with ESR-experiments.2) Part of the excess line width is identified as critical spin fluctuations, following a power law. However, because of the presence of the applied field, the reduced temperaturet is not a good scaling variable. We choose the non-linear susceptibility X s divided byH 2, which scales as the order parameter susceptibility. The experiment yieldsW ex∞(X s /H 2) p ,p=0.42. From this we deduce νz≈3.
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