Formation of heavy quasiparticle state in two-band Hubbard model

Abstract

A realization of heavy fermion state is investigated on the basis of two-band Hubbard model. By means of the slave-boson mean-field approximation, it is shown that for the intermediate electron density, n_e=1.5, the inter-band Coulomb repulsion U strongly emphasizes initially small difference between bands, and easily stabilizes integral valence in the lower band. As a result, a strong renormalization takes place in the lower band and the mixing strength between two bands. It gives rise to a sharp peak at the Fermi level in the quasiparticle density of states, as that obtained in the periodic Anderson model. In contrast to a simple insight that the Hund's-rule coupling J reduces the characteristic energy, it turns out to be almost irrelevant to the renormalization for J<U. The required conditions are suitable for LiV_2O_4, the first observed heavy fermion compound in transition metal oxide.

arXiv comment5 pages, 4 figures, to be published in Phys. Rev. B

References in corpus (9)

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• Electronic structure of spinel-type LiV_2O_4
• Specific Heat (1.2-108 K) and Thermal Expansion (4.4-297 K) Measurements of the 3d Heavy Fermion Compound LiV_{2}O_{4}
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Cited by in corpus (24)

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• Low-Temperature and High-Energy-Resolution Laser Photoemission Spectroscopy
• LiV${}_2$O${}_4$: frustration induced heavy fermion metal
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• Metallic Spin Liquid-like Behavior of LiV${}_2$O${}_4$
• Charge-spin-orbital Fluctuations in Mixed Valence Spinels: Comparative Study of AlV2O4 and LiV2O4
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• Quasi-one-dimensional spin dynamics in LiV2O4: 1D-to-3D crossover as a possible origin of heavy fermion state
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• Putative quantum critical point in the itinerant magnet ZrFe${}_4$Si${}_2$ with a frustrated quasi-one-dimensional structure
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