Lattice Dynamics and Electron-phonon Coupling

Journal of Low Temperature Physics

, Volume 105, Issue 3, pp 807-812

Cu-O bond-stretching vibrations in YBa2Cu3O7 studied by inelastic neutron scattering

  • W. ReichardtAffiliated withForschungszentrum Karlsruhe, Institut für Nukleare Festkörperphysik

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Abstract

Inelastic neutron experiments confirm the previously reported anomalous nature of the planar oxygen bond-stretching vibrations and furnish further details. It is shown that the frequency of the linear breathing mode is renormalized by 5 THz compared to insulating YBa2Cu3O6. Studies of the Cu1-apical O bond-stretching vibrations demonstrate that frequencies, line-widths and phonon intensities can well be understood within the framework of a harmonic lattice dynamical model. This rules out predictions of a double well potential and strong anharmonitity for this type of vibration.

PACS numbers

74.72.Bk 74.25.Ke 63.20.Kr