Publikation: Temperature Effects on the Phonon Spectrum in YBa2Cu3O7 Single Crystals and Thin Films
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We have performed a detailed investigation of the temperature dependence of the 385cm-1 phonon in single crystals and thin films of the YBa2Cu3O7 superconductor by means of Raman spectroscopy. In the single crystal the frequency of this phonon shows a downshift of about 5 cm-1 on passing the superconducting transition from above, which is referred to a strong electron-phonon interaction in the superconductor. The shift of the phonon in thin epitaxial films on MgO or SrTiO3 substrates is only about 2.5 cm-1. This difference may be a result of a structural transition in the single crystal which is possibly suppressed in the films because of the epitaxy. The electron-phonon interaction is also indicated by the asymmetry of the phonon line and a slight increase of the linewidth below Tc.
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FEILE, Rudolf, Paul LEIDERER, Jerzy KOWALEWSKI, Wolf ASSMUS, J. SCHUBERT, Ulrich POPPE, 1989. Temperature Effects on the Phonon Spectrum in YBa2Cu3O7 Single Crystals and Thin Films. In: Journal of the Less Common Metals. 1989, 151, pp. 125-132. Available under: doi: 10.1016/0022-5088(89)90306-8BibTex
@article{Feile1989Tempe-8989, year={1989}, doi={10.1016/0022-5088(89)90306-8}, title={Temperature Effects on the Phonon Spectrum in YBa2Cu3O7 Single Crystals and Thin Films}, volume={151}, journal={Journal of the Less Common Metals}, pages={125--132}, author={Feile, Rudolf and Leiderer, Paul and Kowalewski, Jerzy and Assmus, Wolf and Schubert, J. and Poppe, Ulrich} }
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