  In the present paper we study chemical potential of a generalized Hubbard
model with correlated hopping at half-filling using a generalized mean-field
approximation. For the special case of the model the approach reproduces the
exact results: metal-insulator transition, ground state energy. Chemical
potential of generelized Hubbard model with correlated hoppig as function of
hopping integrals at zero temperature is found. It is shown that chemical
potential of the model is temperature-dependent. The dependences of chemical
potential of a generalized Hubbard model with correlated hopping on the model
parameters are different in metallic and insulating phases leading to a kink at
the point of metal-insulator transition in the ground state. With the increase
of temperature the kink in the chemical potential curve disappears. The
obtained results differ from those of the Hubbard model indicating the
important role of correlated hopping.
