Fermi liquid description for itinerant electron metamagnetism

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Abstract

Because of the Fermi liquid effect, the energy of the itinerant electron system at low temperatures cannot be expanded in even powers of magnetization M but behaves like M2/2χ0 + ƒ1M4 ln(M/M), where χ0 is the low-field susceptibility and ƒ1 and M are constants. If the interaction is sufficiently strong, χ0ƒ1M∗2>e13/6/6, the system exhibits metamagnetism. It is shown that the observed magnetization curves can be described by the simple law H = (M/χ0) + 4ƒ1M3 ln(M/Me-1/4). This model can explain the most salient feature of the observed facts; i.e. the critical field of the metamagnetic transition is proportional to the temperature of the susceptibility maximum.

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