PRESSURE-TEMPERATURE PHASE DIAGRAM OF THE GENERALIZED HUBBARD MODEL WITH
CORRELATED HOPPING AT HALF-FILLING
Author(s): L.Didukh, V.Hankevych (Ternopil State Technical University, Department of Physics, 56 Rus'ka Str., 46001 Ternopil, Ukraine)
In the present paper, the pressure-temperature phase diagram of a generalized Hubbard model with correlated hopping in a paramagnetic state at half-filling is determined by means of a generalized mean-field approximation in the Green function technique. The constructed phase diagram describes the metal-to-insulator transition with increasing temperature, and the insulator-to-metal transition under the action of external pressure. The phase diagram can explain the paramagnetic region of the phase diagrams of some transition metal compounds.
Key words: phase diagram, metal-insulator transition, correlated hopping
PACS: 71.10.Fd, 71.30.+h, 71.27.+a
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