Abstract
A phenomenological theory is developed for the metamagnetism observed in heavy Fermion compounds by extension of the Landau theory for phase transitions. From simple analysis, the crossover behavior in high magnetic fields is indicated for the extended Landau-type free energy density. According to the finite temperature behavior of the extended Landau free energy density, theoretical magnetic phase diagrams that resemble those observed in CeRu\(_{2}\)Si\(_{2}\) and Ce(Ru\(_{0.92}\)Rh\(_{0.08}\))\(_{2}\)Si\(_{2}\) are obtained by using two sets of parameters, respectively.
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