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Resonant Raman Study of Superconducting Gap and Electron-Phonon Coupling in YbBa2Cu3O7−δ

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Abstract

We investigate the electronic background as well as the 02-03 mode at 330 cm −1 of highly doped YbBa 2 Cu 3 O 7−δ in B 1g symmetry. Above the critical temperature T.c the spectra consist of an almost constant electronic background and superimposed phononic excitations. Below T c the superconducting gap opens and the electronic background redistributes exhibiting a 2Δ peak at 320 cm −1 . We use a model that allows us to separate the background from the phonon. In this model the phonon intensity is assigned to the coupling of the phonon to inter- and intraband electronic excitations. For excitation energies between 1.96 eV and 2.71 eV the electronic background exhibits hardly any resonance. Accordingly, the intraband contribution to the phonon intensity is not affected. In contrast, the interband contribution vanishes below T c at 1.96 eV while it remains almost unaffected at 2.71 eV.

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Authors and Affiliations

  1. Institut für Angewandte Physik, Jungiusstraße 11, D-20355, Hamburg

    S. Ostertun, J. Kiltz, T. Wolf & A. Bock

  2. ITP, Forschungszentrum Karlsruhe, Postfach 3640, D-76021, Karlsruhe

    T. Wolf

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  1. S. Ostertun
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  2. J. Kiltz
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  3. T. Wolf
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  4. A. Bock
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Ostertun, S., Kiltz, J., Wolf, T. et al. Resonant Raman Study of Superconducting Gap and Electron-Phonon Coupling in YbBa2Cu3O7−δ . Journal of Low Temperature Physics 117, 425–429 (1999). https://doi.org/10.1023/A:1022590221383

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