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EnglishWe present a first study of the antiferromagnetic state in the 2D U-t-t′ model at finite temperatures by the composite operator method, providing simultaneously a fully self-consistent treatment of the paramagnetic and the AF phase. Near half-filling the critical value of the Coulomb repulsion as a function of t′ and the temperature dependence of the magnetization and of the internal energy per site have been studied. © 2000 Elsevier Science B.V. All rights reserved.
| Titolo: | Antiferromagnetism in the 2D Hubbard model: Phase transition and local quantities |
| Autori: | |
| Data di pubblicazione: | 2000 |
| Rivista: | |
| Abstract: | We present a first study of the antiferromagnetic state in the 2D U-t-t′ model at finite temperatures by the composite operator method, providing simultaneously a fully self-consistent treatment of the paramagnetic and the AF phase. Near half-filling the critical value of the Coulomb repulsion as a function of t′ and the temperature dependence of the magnetization and of the internal energy per site have been studied. © 2000 Elsevier Science B.V. All rights reserved. |
| Handle: | http://hdl.handle.net/11386/1064914 |
| Appare nelle tipologie: | 1.1.2 Articolo su rivista con ISSN |
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