Model analysis for pressure effects on the magnetic susceptibility and the magnetization process of valence fluctuating compounds

Abstract In order to analyze theoretically the pressure effect on magnetic properties of valence fluctuating systems, we have used the periodic Anderson model (PAM) which is a theoretical model for valence fluctuating systems and calculated some physical quantities including the magnetic susceptibility and the magnetization process of the PAM by the self-consistent second-order perturbation theory. In the present study, it is shown that the magnetic susceptibility at lower temperature is enhanced by decreasing the hybridization energy between conduction electrons and f electrons. Since it is considered that the f electron becomes local with decreasing the hybridization energy and the localization of the f electron tends to be favored by the external pressure for Yb-based compounds, it is expected that the magnetic susceptibility of Yb-based valence fluctuating compounds at lower temperature is enhanced with increasing pressure.