  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.
