Competition between crystalline electric field singlet and itinerant states of f electrons

Details Competition between crystalline electric field singlet and itinerant states of f electrons Competition between crystalline electric field singlet and itinerant states of f electrons

1997-06-13

arxiv.org/abs/cond-mat/9706134v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages LaTeX , 2 eps figures Accepted for publication in Z.Phys.B

Scientific paper

10.1007/s002570050487

A new kind of phase transition is proposed for lattice fermion systems with simplified f^2 configurations at each site. The free energy of the model is computed in the mean-field approximation for both the itinerant state with the Kondo screening, and a localized state with the crystalline electric field (CEF) singlet at each site. The presence of a first-order phase transition is demonstrated in which the itinerant state changes into the localized state toward lower temperatures. In the half-filled case, the insulating state at high temperatures changes into a metallic state, in marked contrast with the Mott transition in the Hubbard model. For comparison, corresponding states are discussed for the two-impurity Kondo system with f^1 configuration at each site.

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