Hubbard chains network on corner-sharing tetrahedra: origin of the heavy fermion state in LiV2O4
Abstract
We investigate the Hubbard chains network model defined on corner-sharing tetrahedra (the pyrochlore lattice) which is a possible microscopic model for the heavy fermion state of LiV2O4. Based upon this model, we can explain transport, magnetic, and thermodynamic properties of LiV2O4. We calculate the spin susceptibility, and the specific heat coefficient, exploiting the Bethe ansatz exact solution of the 1D Hubbard model and bosonization method. The results are quite consistent with experimental observations. We obtain the large specific heat coefficient γ 222 mJ/mol K2.
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