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Title: Size effect on the electron-phonon coupling in CuO nanocrystals
Authors: Fan, H. 
Zou, B.
Liu, Y.
Xie, S.
Issue Date: 28-Feb-2006
Citation: Fan, H., Zou, B., Liu, Y., Xie, S. (2006-02-28). Size effect on the electron-phonon coupling in CuO nanocrystals. Nanotechnology 17 (4) : 1099-1103. ScholarBank@NUS Repository.
Abstract: CuO is the prototype compound of cuprate superconductors, so understanding its electronic structures will facilitate the study of the pairing mechanism and miscellaneous states of high-temperature superconductors. We prepared uniform CuO nanocrystals (7-100 nm) and studied their size-dependent Raman scattering spectra. The relative variation between the two-phonon scattering band (2B g) and the one-phonon band (Bg) indicates a decreasing electron-phonon coupling with reducing size, which unveils the dominant Fröhlich electron-phonon coupling, as indicated by Devreese, but not the small polaron in CuO. Moreover, the anomalous enhancement of the multi-phonon band at a critical size and 1D structure at room temperature is attributable to an enhanced electron-phonon coupling accompanied by phonon-plasmon coupling, i.e., the 'plasphon' proposed by Alexandrov et al in 1981. © 2006 IOP Publishing Ltd.
Source Title: Nanotechnology
ISSN: 09574484
DOI: 10.1088/0957-4484/17/4/042
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