OFF-DIAGONAL LONG RANGE ORDER IN AN ELECTRON-PHONON MODEL FOR HIGH-TcSUPERCONDUCTORS

M. Frick, I. Morgenstern and W. von der Linden
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M. Frick: Institute for Theoretical Physics, University of Groningen, PO-Box 800, 9700 AV Groningen, The Netherlands;
I. Morgenstern: Institute for Theoretical Physics, University of Regensburg, 8400 Regensburg, Germany
W. von der Linden: Max-Planck Institute for Plasma Physics, Boltzmannstr.2, 8046 Garching, Germany

International Journal of Modern Physics C (IJMPC), 1992, vol. 03, issue 01, 105-120

Abstract: We study a model for high-Tcsuperconductors describing both the strong electronic correlations and a coupling of the carriers to anharmonic phonons. The Projector Quantum Monte Carlo Scheme has been employed to investigate ground state properties. We analyze the superconducting properties of the model by directly addressing to the existence of Off-Diagonal Long Range Order (ODLRO). We review the numerical algorithm and discuss the possibility to observe ODLRO. In the presented model, we find ODLRO pointing towards superconductivity instead of the presence of strong electronic correlations. We discuss several features of the superconducting condensate.

Keywords: High-Temperature Superconductivity; Strong Electronic Correlations; Anharmonic Phonons; Projector Quantum Monte Carlo; Off-Diagonal Long Range Order (search for similar items in EconPapers)
Date: 1992
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DOI: 10.1142/S0129183192000099

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