Phase separation and three-site hopping in the 2-dimensional t-J model

Ercolessi, E.; Pieri, Pierbiagio; Roncaglia, M.

doi:10.1016/S0375-9601(97)00464-7

We study the t-J model with the inclusion of the so-called three-site term which is due to 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 non-magnetic 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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Titolo:	Phase separation and three-site hopping in the 2-dimensional t-J model
Autori:	E. ERCOLESSI PIERI, Pierbiagio M. RONCAGLIA mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	1997
Rivista:	PHYSICS LETTERS A
Abstract:	We study the t-J model with the inclusion of the so-called three-site term which is due to 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 non-magnetic 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.
Handle:	http://hdl.handle.net/11581/200492
Appare nelle tipologie:	Articolo

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