We discuss a many-electron Hamiltonian with Hubbard-like repulsive interaction and linear coupling to the phonon branches, having the Cu-O plane of the superconducting cuprates as a paradigm. A canonical transformation extracts an effective two-body problem from the many-body theory. As a prototype system we study the CuO4 cluster, which yields electronic pairing in the Hubbard model; moreover, a standard treatment of the Jahn-Teller effect predicts distortions that destroy electronic pairing. Remarkably, calculations that keep all the electronic spectrum into account show that vibrations are likely to be synergic with electronic pairing, if the coupling to half-breathing modes predominates, as experiments suggest

Perfetto, E., Cini, M. (2004). Electron-phonon interactions in the W=0 pairing scenario. JOURNAL OF PHYSICS. CONDENSED MATTER, 16, 4845.

Electron-phonon interactions in the W=0 pairing scenario

Perfetto, E;CINI, MICHELE
2004-01-01

Abstract

We discuss a many-electron Hamiltonian with Hubbard-like repulsive interaction and linear coupling to the phonon branches, having the Cu-O plane of the superconducting cuprates as a paradigm. A canonical transformation extracts an effective two-body problem from the many-body theory. As a prototype system we study the CuO4 cluster, which yields electronic pairing in the Hubbard model; moreover, a standard treatment of the Jahn-Teller effect predicts distortions that destroy electronic pairing. Remarkably, calculations that keep all the electronic spectrum into account show that vibrations are likely to be synergic with electronic pairing, if the coupling to half-breathing modes predominates, as experiments suggest
2004
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - FISICA DELLA MATERIA
English
Con Impact Factor ISI
Perfetto, E., Cini, M. (2004). Electron-phonon interactions in the W=0 pairing scenario. JOURNAL OF PHYSICS. CONDENSED MATTER, 16, 4845.
Perfetto, E; Cini, M
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/55640
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