Torque measurements have been made as a function of temperature on a Cu-2-at.%-Mn and a Au-18-at.%-Fe alloy. At a field-dependent temperature T*(H) torque effects go to zero indicating the frontier for the low-temperature strong-irreversibility regime. For the CuMn sample the present experimental T*(H) curve coincides with the calculated mean-field-model de Almeida-Thouless line. For the AuFe, T*(H) also follows the behavior predicted for the strong-irreversibility crossover on the mean-field model.
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Campbell et al. (1983) studied this question.
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