An attempt has been made to determine the irreversibility temperatures [Tᵣ(H)] via the merger of zero-field-cooled and field-cooled magnetizations, via the vanishing of the isothermal hysteresis, and via the appearance of the differential paramagnetic effect in specimens of lead and niobium. The first method appears to define a lower limit on Tᵣ(H) and does not necessarily indicate a true thermodynamic region near Tc(H). The differential paramagnetic effect, however, is a qualitative feature whose presence is sufficient to imply reversibility.
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Ramakrishnan et al. (1991) studied this question.
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