ausblenden:
Schlagwörter:
high-T-c superconductors; dielectric response; electron-phonon interactions; light absorption and reflection
Zusammenfassung:
The in-plane dielectric response of detwinned YBa2Cu3O6.95 has
been studied by far-infared ellipsometry. A surprisingly large
number of in-plane polarized modes are observed. Some of them
correspond to pure phonon modes. Others possess a large
electronic contribution which strongly increases in the
superconducting state. The free carrier response and the
collective modes exhibit a Pronounced a-b anisotropy. We
discuss our results in terms of a charge density wave state in
the 1-D CuO chains and induced charge density fluctuations
within the 2-D CuO2 planes. (C) 2002 Elsevier Science Ltd. All
rights reserved.
