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Author Domanski, T. ♦ Wysokinski, K. I. ♦ Ramakumar, R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ HUBBARD MODEL ♦ SUPERCONDUCTIVITY ♦ PHASE TRANSFORMATIONS ♦ ELECTRON CORRELATION ♦ TRANSITION TEMPERATURE ♦ S WAVES ♦ D WAVES ♦ ORDER PARAMETERS ♦ BAND THEORY ♦ MAGNETIC PROPERTIES
Abstract We study superconductivity in the extended Hubbard model with a strong on-site repulsion {ital U} and weak attractive density-density interaction {ital V}{sub {ital ij}}. The electron correlation effects, beyond the weak-coupling regime of {ital U}, are included approximately by employing Hubbard decoupling approximations. The formulas for superconducting transition temperature {ital T}{sub {ital c}} of the present approach are compared to those obtained with the strong-coupling expansion and slave-boson techniques. The methods share some common features. We discuss behavior of {ital T}{sub {ital c}} for superconducting phases with {ital s}- and {ital d}-wave symmetry of the superconducting order parameter. In contrast to the mean-field treatment of {ital U}, we find that the strong on-site repulsion does not destroy superconductivity induced by {ital V}{sub {ital ij}}{lt}0 even when {ital U}{gt}{vert_bar}{ital V}{sub {ital ij}}{vert_bar}. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-08-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 5


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