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Title: Pairing Correlations on t- U- J Ladders

Abstract

We find that the pairing correlations on the usual t-U Hubbard ladder are significantly enhanced by the addition of a nearest-neighbor exchange interaction J . Likewise, these correlations are also enhanced for the t-J model when the on-site Coulomb interaction is reduced from infinity. Moreover, the pairing correlations are larger on a t-U-J ladder than on a t-J{sub eff} ladder in which J{sub eff} has been adjusted so that the two models have the same spin gap at half filling. This enhancement of the pairing correlations is associated with an increase in the pair-binding energy and the pair mobility in the t-U-J model and points to the importance of the charge-transfer nature of the cuprate systems. (c) 2000 The American Physical Society.

Authors:
 [1];  [2];  [3]
  1. Institute for Theoretical Physics, University of California, Santa Barbara, California 93106 (United States)
  2. Physics Department, University of California, Santa Barbara, California 93106 (United States)
  3. Department of Physics and Astronomy, University of California, Irvine, California 92697 (United States)
Publication Date:
OSTI Identifier:
20216336
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 84; Journal Issue: 18; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; HUBBARD MODEL; PAIRING INTERACTIONS; HIGH-TC SUPERCONDUCTORS; ELECTRONIC STRUCTURE; BINDING ENERGY; CUPRATES; ELECTRON-ELECTRON INTERACTIONS; EXCHANGE INTERACTIONS; THEORETICAL DATA

Citation Formats

Daul, S., Scalapino, D. J., and White, Steven R. Pairing Correlations on t- U- J Ladders. United States: N. p., 2000. Web. doi:10.1103/PhysRevLett.84.4188.
Daul, S., Scalapino, D. J., & White, Steven R. Pairing Correlations on t- U- J Ladders. United States. doi:10.1103/PhysRevLett.84.4188.
Daul, S., Scalapino, D. J., and White, Steven R. Mon . "Pairing Correlations on t- U- J Ladders". United States. doi:10.1103/PhysRevLett.84.4188.
@article{osti_20216336,
title = {Pairing Correlations on t- U- J Ladders},
author = {Daul, S. and Scalapino, D. J. and White, Steven R.},
abstractNote = {We find that the pairing correlations on the usual t-U Hubbard ladder are significantly enhanced by the addition of a nearest-neighbor exchange interaction J . Likewise, these correlations are also enhanced for the t-J model when the on-site Coulomb interaction is reduced from infinity. Moreover, the pairing correlations are larger on a t-U-J ladder than on a t-J{sub eff} ladder in which J{sub eff} has been adjusted so that the two models have the same spin gap at half filling. This enhancement of the pairing correlations is associated with an increase in the pair-binding energy and the pair mobility in the t-U-J model and points to the importance of the charge-transfer nature of the cuprate systems. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevLett.84.4188},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 18,
volume = 84,
place = {United States},
year = {2000},
month = {5}
}