Artículo
U-J synergy effect for high-T c superconductors
Fecha de publicación:
12/2005
Editorial:
American Physical Society
Revista:
Physical Review B: Condensed Matter and Materials Physics
ISSN:
1098-0121
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Using the renormalization group with included self-energy effects and exact diagonalization of small clusters we investigate the ground-state phase diagram of a two-dimensional extended Hubbard model with nearest-neighbor exchange interaction J, in addition to the local Coulomb repulsion U. The main instabilities are antiferromagnetism close to half filling and d x2-y2 superconductivity in the doped system. We find that self-energy effects are fatal for superconductivity in the repulsive Hubbard model (i.e., J=0, u>0). The superconductivity is triggered by finite J. The combined action of J and U interactions provide a remarkably efficient, mechanism to enhance both d x2-y2 superconducting and antiferromagnetic correlations. © 2005 The American Physical Society.
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Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Arrachea, Liliana del Carmen; Zanchi, Dra?en; U-J synergy effect for high-T c superconductors; American Physical Society; Physical Review B: Condensed Matter and Materials Physics; 71; 6; 12-2005; 64519-64529
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