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Thermodynamics of the metal-insulator transition in the extended Hubbard model
by M. Schüler, E. G. C. P. van Loon, M. I. Katsnelson, T. O. Wehling
In contrast to the Hubbard model, the extended Hubbard model, which
additionally accounts for non-local interactions, lacks systemic studies of
thermodynamic properties especially across the metal-insulator transition.
Using a variational principle, we perform such a systematic study and describe
how non-local interactions screen local correlations differently in the
Fermi-liquid and in the insulator. The thermodynamics reveal that non-local
interactions are at least in parts responsible for first-order metal-insulator
transitions in real materials.