Spin and charge fluctuation in an extended Hubbard model of oxide superconductors
Abstract
Antiferromagnetic spin fluctuations and charge-transfer correlation are studied in an extended Hubbard model of cuprate superconductors. We have carried out finite-temperature Monte Carlo and variational Monte Carlo simulations of CuO[sub 2] lattices described by a three-band Hubbard model. Using parameters derived by local-density-functional theory, our results appear to be consistent with experimental data. At half-filling, we find strong antiferromagnetic correlation with large local moment on copper sites and evidence of a charge-transfer gap. Upon doping, the antiferromagnetic correlations decrease; the excess holes primarily go onto the oxygen sites, while additional electrons prefer the copper sites. Equal-time pairing correlation functions suggest that extended [ital s]-wave and [ital d]-wave pairing are possible in this model.
- Authors:
-
- Department of Physics and Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742 (United States)
- Publication Date:
- OSTI Identifier:
- 5990650
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review, B: Condensed Matter; (United States)
- Additional Journal Information:
- Journal Volume: 48:18; Journal ID: ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; HIGH-TC SUPERCONDUCTORS; HUBBARD MODEL; FLUCTUATIONS; ANTIFERROMAGNETISM; CHARGE EXCHANGE; COMPUTERIZED SIMULATION; CUPRATES; MONTE CARLO METHOD; VARIATIONAL METHODS; CALCULATION METHODS; COPPER COMPOUNDS; CRYSTAL MODELS; MAGNETISM; MATHEMATICAL MODELS; OXYGEN COMPOUNDS; SIMULATION; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; VARIATIONS; 665411* - Basic Superconductivity Studies- (1992-)
Citation Formats
Bhattacharya, A, and Wang, C S. Spin and charge fluctuation in an extended Hubbard model of oxide superconductors. United States: N. p., 1993.
Web. doi:10.1103/PhysRevB.48.13949.
Bhattacharya, A, & Wang, C S. Spin and charge fluctuation in an extended Hubbard model of oxide superconductors. United States. https://doi.org/10.1103/PhysRevB.48.13949
Bhattacharya, A, and Wang, C S. 1993.
"Spin and charge fluctuation in an extended Hubbard model of oxide superconductors". United States. https://doi.org/10.1103/PhysRevB.48.13949.
@article{osti_5990650,
title = {Spin and charge fluctuation in an extended Hubbard model of oxide superconductors},
author = {Bhattacharya, A and Wang, C S},
abstractNote = {Antiferromagnetic spin fluctuations and charge-transfer correlation are studied in an extended Hubbard model of cuprate superconductors. We have carried out finite-temperature Monte Carlo and variational Monte Carlo simulations of CuO[sub 2] lattices described by a three-band Hubbard model. Using parameters derived by local-density-functional theory, our results appear to be consistent with experimental data. At half-filling, we find strong antiferromagnetic correlation with large local moment on copper sites and evidence of a charge-transfer gap. Upon doping, the antiferromagnetic correlations decrease; the excess holes primarily go onto the oxygen sites, while additional electrons prefer the copper sites. Equal-time pairing correlation functions suggest that extended [ital s]-wave and [ital d]-wave pairing are possible in this model.},
doi = {10.1103/PhysRevB.48.13949},
url = {https://www.osti.gov/biblio/5990650},
journal = {Physical Review, B: Condensed Matter; (United States)},
issn = {0163-1829},
number = ,
volume = 48:18,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 1993},
month = {Mon Nov 01 00:00:00 EST 1993}
}