Valence Fluctuation from f^2 Singlet Crystal-Field Ground State in Generalized Periodic Anderson Model(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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A generalized periodic Anderson model with stable f^2 configuration is examined through a Gutzwiller-type variational method (GM). In particular, we focus on the effect of the f^2 crystal-field (CF) level scheme with singlet ground and triplet low-lying excited states. It is demonstrated that valence fluctuation from the f^2 states is slightly enhanced by a small singlet-triplet CF splitting whereas it becomes strongly suppressed as the splitting increases. The GM predicts that this valence change caused by the CF is discontinuous in the case of small hybridization. The influence of the CF on magnetic properties is studied in terms of the Landau parameter of magnetic susceptibility.
社団法人日本物理学会の論文
2005-12-15