U-J synergy effect for high-T c superconductors

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...

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Autores principales: Arrachea, L., Zanchi, D.
Formato: JOUR
Materias:
article
calculation
energy
magnetism
mathematical analysis
mathematical model
superconductor
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10980121_v71_n6_p_Arrachea
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_10980121_v71_n6_p_Arrachea2023-10-03T16:05:54Z U-J synergy effect for high-T c superconductors Arrachea, L. Zanchi, D. article calculation energy magnetism mathematical analysis mathematical model superconductor 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10980121_v71_n6_p_Arrachea
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic article
calculation
energy
magnetism
mathematical analysis
mathematical model
superconductor
spellingShingle article
calculation
energy
magnetism
mathematical analysis
mathematical model
superconductor
Arrachea, L.
Zanchi, D.
U-J synergy effect for high-T c superconductors
topic_facet article
calculation
energy
magnetism
mathematical analysis
mathematical model
superconductor
description 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.
format JOUR
author Arrachea, L.
Zanchi, D.
author_facet Arrachea, L.
Zanchi, D.
author_sort Arrachea, L.
title U-J synergy effect for high-T c superconductors
title_short U-J synergy effect for high-T c superconductors
title_full U-J synergy effect for high-T c superconductors
title_fullStr U-J synergy effect for high-T c superconductors
title_full_unstemmed U-J synergy effect for high-T c superconductors
title_sort u-j synergy effect for high-t c superconductors
url http://hdl.handle.net/20.500.12110/paper_10980121_v71_n6_p_Arrachea
work_keys_str_mv AT arracheal ujsynergyeffectforhightcsuperconductors
AT zanchid ujsynergyeffectforhightcsuperconductors
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