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- Title
Role of the Electron–Phonon Interaction on the Spectral Density and Pseudogap in Cuprates.
- Authors
Chaudhuri, I.; Ghatak, S. K.
- Abstract
The pseudogap structure in low energy excitation in cuprates appears below a temperature and the spectral density exhibits strong wave-vector dependence. An electronic model that emphasized the coupling of carrier in Cu-O with phonon is examined for pseudogap. The electron-phonon interaction originates from the modulation of on-site and hopping energy and leads to spontaneous Jahn-Teller-like distortion and pseudogap below a critical temperature. At low temperature the spectral density has two-peak structure about the Fermi level for all k along Γ-M whereas such structure exists along Γ-Χ for small k only. The magnitude of pseudogap shows strong k-dependence — maximum along Γ-M and vanishes along Γ-Χ. These features emphasize the role of electron-phonon interaction in formation of pseudogap.
- Subjects
ELECTRON-phonon interactions; SPECTRAL energy distribution
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2002, Vol 16, Issue 23, p3465
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979202011184