Electron-Phonon Coupling Deduced from Phonon Line Shapes

Details Electron-Phonon Coupling Deduced from Phonon Line Shapes Electron-Phonon Coupling Deduced from Phonon Line Shapes

1999-08-25

arxiv.org/abs/cond-mat/9908356v1

phys. stat. sol. (b) 215, p. 495 (1999)

Physics

Condensed Matter

Superconductivity

6 pages including 2 figures, accepted for publication in Physica Status Solidi (b) contribution to ICSSS, September 1999 in Sc

Scientific paper

We investigate the Fano-type line shape of the Ba mode of Y_{1-x}Ca_xBa_2Cu_3O_{6+y} films observed in Raman spectra with A_1g symmetry. The line shape is described with an extended Fano formula that allows us to obtain the bare phonon parameters and the self-energy effects based on a phenomenological description of the real and imaginary part of the low-energy electronic response. It turns out that the phonon intensity originates almost entirely from a coupling to this electronic response with negligible contributions from interband (high-energy) electronic excitations. In the normal state we obtain a measure of the electron-phonon coupling via the mass-enhancement factor lambda. We find lambda=6.8 +/- 0.5 % around optimum doping and only weak changes of the self-energy in the superconducting state. With increased disorder at the Ba site we find a decreased intensity of the Ba mode which we can relate to a decreased electron-phonon coupling.

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