Evidence of strong electron-phonon coupling from infrared excited Raman scattering in the YBa2Cu3O7-y superconducting system

Zamboni, R. ; Ruani, G. ; Pal, A. J. ; Taliani, C. (1989) Evidence of strong electron-phonon coupling from infrared excited Raman scattering in the YBa2Cu3O7-y superconducting system Solid State Communications, 70 (8). pp. 813-816. ISSN 0038-1098

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0038-1098(89)90504-8

Abstract

Infrared excited Raman spectra at 1064 nm (1.16 eV) of the YBa2Cu3O7-y superconducting ceramic system were measured by means of Fourier transform interferometry (FT-Raman) at different oxygen stoichiometries. The standard Raman scattering spectrum excited with visible light was measured for comparison. The FT-Raman spectrum of YBa2Cu3O7-y (y≥0.7) is dominated by the multiple order scattering of the 505 cm-1 Ag Cu(1)-O(4) axial stretching vibration. This effect is accounted for by a Frank-Condon Raman scattering due to the strong electron-phonon coupling between the axial mode and the local electronic transitions that contribute to the low energy absorption tail of YBa2Cu3O7-y. In view of this we tentatively assign the interband gap to a perpendicular charge transfer transition.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:65634
Deposited On:17 Oct 2011 10:42
Last Modified:17 Oct 2011 10:42

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