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RESEARCH PRODUCT

Temperature Effects on the Phonon Spectrum in YBa2Cu3O7 Single Crystals and Thin Films

Paul LeidererUlrich PoppeJürgen SchubertRudolf FeileJerzy KowalewskiWolf Assmus

subject

Materials scienceHigh-temperature superconductivityPhononEpitaxylaw.inventionsymbols.namesakeCondensed Matter::Materials SciencelawCondensed Matter::SuperconductivityGeneral Materials Scienceddc:530Thin filmInorganic compoundLine (formation)chemistry.chemical_classificationSuperconductivityCondensed matter physicsSpectrum (functional analysis)General EngineeringCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsElectronic Optical and Magnetic MaterialschemistrysymbolsCondensed Matter::Strongly Correlated ElectronsSingle crystalRaman scattering

description

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.

yearjournalcountryeditionlanguage
1989-05-01
10.1016/0022-5088(89)90306-8