Pressure-Temperature Phase Diagram of Generalized Hubbard Model with Correlated Hopping at Half-Filling

Details Pressure-Temperature Phase Diagram of Generalized Hubbard Model with Correlated Hopping at Half-Filling Pressure-Temperature Phase Diagram of Generalized Hubbard Model with Correlated Hopping at Half-Filling

2000-09-04

arxiv.org/abs/cond-mat/0009037v1

Condensed Matter Physics, vol.4, pp.93-100 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, Latex 2.09 using Cond. Matt. Phys. style, submitted to Condensed Matter Physics

Scientific paper

In the present paper pressure-temperature phase diagram of a generalized Hubbard model with correlated hopping in a paramagnetic state at half-filling is determined by means of the generalized mean-field approximation in the Green function technique. The constructed phase diagram describes metal-to-insulator transition with increasing temperature, and insulator-to-metal transition under the action of external pressure. The phase diagram can explain paramagnetic region of the phase diagrams of some transition metal compounds. We have found that taking into account correlated hopping allows much better description of these experimental data than the Hubbard model; this testifies also much better physics of the present model and the important role of correlated hopping.

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