Phase Separation and Three-site Hopping in the 2-dimensional t-J Model
Elisa Ercolessi, Pierbiagio Pieri, Marco Roncaglia
Abstract
We study the t-J model with the inclusion of the so called three-site term which comes out from the t/U --> 0 expansion of the Hubbard model. We find that this singlet pair hopping term has no qualitative effect on the structure of the pure mean field phase diagram for nonmagnetic states. In accordance with experimental data on high-Tc materials and some numerical studies, we also find wide regions of phase coexistence whenever the coupling J is greater than a critical value Jc. We show that Jc varies linearly with the temperature T, going to zero at T=0.
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