Quasicritical behavior

A simple model to explain the [iSR response in CeNiSn has been offered by Kagan and Kalvius (1995). They propose that the features seen by [iSR are the manifestation of a very small difference in the ground-state energy of the spin-liquid phase and a magnetically ordered phase. This results in quasicritical behavior and is equivalent to the appearance of an effective Curie temperature, which is located formally in the negative temperature region (-7 ). Within the mean-field approximation (MFA) and for small values of T one finds for the static susceptibility ... 

O Brien, J. A., T. W. Randolph, C. Carlier, and S. Ganapathy 1993, Quasicritical behavior of dense-gas solvent-solute clusters at near-infinite dilution . AIChE J. 39, 876. 

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