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The equilibrium and nonequilibrium susceptibilities ₄ and ₍₄ of the spin-glass ({Fe₀. ₆₄Mn₀. ₃₆) }₇₅P₁₆B₆Al₃ have been measured as functions of temperature (4. 2<~T<~80 K) and a cooling field (8 Oe<~H<~2 kOe). A phase transition occurs at a temperature T₂ (H) below which the irreversible response (T) (₄-₍₄) appears. T₂ (H) decreases from the freezing temperature (T₅=41. 6 K) as H^0. 750. 1. For small 1-T{T₂ (H) }, behaves as A+B^2 with field-dependent coefficients A and B and A (H=0) =0. The results are compared with the predictions of the mean-field theory of spin-glasses.
Yeshurun et al. (Sun,) studied this question.