Phase Separation and Three-site Hopping in the 2-dimensional t-J Model

Details Phase Separation and Three-site Hopping in the 2-dimensional t-J Model Phase Separation and Three-site Hopping in the 2-dimensional t-J Model

1997-01-24

arxiv.org/abs/cond-mat/9701181v2

Phys. Lett. A 233, 451 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, LaTex, 3 Postscript figures

Scientific paper

10.1016/S0375-9601(97)00464-7

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-T_c materials and some numerical studies, we also find wide regions of phase coexistence whenever the coupling J is greater than a critical value J_c. We show that J_c varies linearly with the temperature T, going to zero at T=0.

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