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Dynamic-susceptibility data on Eu₀. ₄Sr₀. ₆S spin glass above its transition temperature are found to obey an activated (logarithmic) dynamic scaling form, implying a generalized Vogel-Fulcher relation { (T-{T₆) }^} with 0. 65. With use of a fractal-cluster model, a novel scaling relation for another of the exponents is derived and tested experimentally. The "2 rule" relating real and imaginary susceptibilities is derived for systems obeying activated scaling.
Malozemoff et al. (Sat,) studied this question.
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