Abstract
Based on the law of approach to saturation and the experimental results of magnetic moments of PrNi5, the exchange interaction-effective field in PrNi5 is given under a strong magnetic field and at low temperature, which is shown as Hin=aHe+bHe3/2+cHe2. By using the exchange interaction-effective field, the Zeeman Hamiltonian can be calculated directly without using the self-consistent method. Furthermore, the magnetic moment, the magnetic entropy and the magnetic entropy changes of PrNi5 are calculated in the ranges of 0<He<20T and 2<T<60K. The obtained results are in good agreement with the experimental data. The investigation indicates that the exchange interaction-effective field in PrNi5, under the strong magnetic field and at low temperature, is only a function of the applied field.
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