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Abstract:
The specific heat, C(T), of the insulating spin-glass EuxSr1−xS with x=0.40 exhibits a linear term γT and no singularity at Tf, like metallic spin-glasses. A new term, δT−2, is found which may arise from totally decoupled clusters created by frustration. The field dependence, γ(B) and δ(B), show maxima. With x=0.54 the behavior is similar. C(T, B) and χ(T, B) there indicate the spin-glass phase to be supressed at B=1 T.
