Interplay of Crystal Field Structures with f^2 Configuration to Heavy Fermions(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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We examine a relevance between characteristic of crystal field structures and heavily renormalized quasiparticle states in the f^0-f^1-f^2 Anderson lattice model. Using a slave-boson mean-field approximation, we find that for f^2 configurations two or three quasiparticle bands are formed near the Fermi level depending on the number of the relevant f^1 orbitals in the f^2 crystal field ground state. The inter-orbital correlations characterizing the crystal field ground state closely reflect in inter-band residual interactions among quasiparticles. Particularly in the case of a singlet crystal field ground state, resulting residual antiferromagnetic exchange interactions among the quasiparticles lead to an anomalous suppression of the quasiparticle contribution of the spin susceptibility, even though the quasiparticle mass is strongly enhanced.
社団法人日本物理学会の論文
2005-01-15