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Temperature effects on the phonon spectrum in YBa2Cu3O7 single crystals and thin films |
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| Authors: | R Feile P Leiderer J Kowalewski W Assmus J Schubert U Poppe |
| Institution: | (1) Institut für Physik, Universität Mainz, Postfach 3980, D-6500 Mainz, Federal Republic of Germany;(2) Physikalisches Institut, Universität Frankfurt, Robert-Mayer-Strasse 2-4, D-6000 Frankfurt am Main 11, Federal Republic of Germany;(3) Institut für Festkörperforschung, Kernforschungsanlage Jülich, Postfach 1913, D-5170 Jülich 1, Federal Republic of Germany |
| Abstract: | We have performed detailed investigations on the temperature dependence of the 335 cm–1 phonon in single crystals and thin films of the YBa2Cu3O7 superconductor. The frequency of this phonon exhibits a downshift of about 5 cm–1 on passing the superconducting transition from above. The shift of the phonon in thin epitaxial films on MgO or SrTiO3 substrates is only about 2.5 cm–1. The width of the asymmetric phonon line displays a slight increase belowT c due to the electron-phonon interaction in these systems. |
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