Large Pressure Effects on the Magnetic Phase Diagrams of CeSb and Cex(La0.76Y0.24)1−xSb Compounds
Cerium and uranium monopnictides of rocksalt structure, exhibit unusual and very anisotropic magnetic properties compared to the other rare earth or actinide compoundsl. This behavior is attributed to the proximity of the 4f (or 5f) level and the Fermi level. To explain this trend, Cooper et al.2 have proposed an interaction between the f electrons via the d electrons of the rare earth, whereas Takegahara, Yanase and Kasuya3 have suggested a strong hybridization between the f electrons of the rare earth and the p electrons of the valence band. This f-p hybridization, normally smaller than the f-d one, is enhanced by the proximity of pnictide and cerium atoms and by the existence of p-holes in the valence band due to the semimetallic character of these compounds3−6. CeN,which is metallic, is considered as non-magnetic. The complexity of the magnetic properties increases with the semimetallic character in the cerium monopnictides series from CeN to CeBi. A strong exchange anisotropy due to multiphase behavior arises for CeSb and CeBi and in contrast with the other rare earth monopnictides, the splitting Δ between the ground state and the excited state is unusually small7,8.
KeywordsValence Band Easy Magnetization Axis Magnetic Phase Diagram Neel Temperature Rocksalt Structure
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