FINITE-TEMPERATURE MAGNETIC-PROPERTIES OF THE HIGHLY CORRELATED ANDERSON LATTICE

A major success of the periodic Anderson model (PAM) is in explaining a variety of properties of systems containing an array of rare earth ( RE) ions. The magnetic properties of these systems in particular have also been investigated both theoretically and experimentally. In an ea rlier publication the magnetic properties of PAM have been reported fo r T = 0, The calculations were performed by assuming that the double o ccupation of the states localized on RE ions is forbidden. The present paper extends the calculation to finite temperature. From the study o f the normalized spontaneous magnetization m(f) and the magnetic susce ptibility chi, as a function of temperature and the model parameters, several interesting features emerge. These features are explained usin g the interplay of the various interactions in the model. Further, the results are compared with some of the experimental results. For examp le, the peak in chi, the linear correlation between chi(T = 0) and the peak temperature T-0, and a peak in Curie temperature as a function o f chemical composition which are observed experimentally are obtained in the present calculation. Finite temperature calculations for the sa me model are available but in the weak correlation limit. The results of the present calculation are compared with these calculations and th e significant differences are pointed out.