In-plane polarized collective modes in detwinned YBa$_{2}$Cu$_{3}$O$_{6.95}$ observed by spectral ellipsometry

Details In-plane polarized collective modes in detwinned YBa$_{2}$Cu$_{3}$O$_{6.95}$ observed by spectral ellipsometry In-plane polarized collective modes in detwinned YBa$_{2}$Cu$_{3}$O$_{6.95}$ observed by spectral ellipsometry

2001-07-27

arxiv.org/abs/cond-mat/0107575v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/S0038-1098(01)00451-3

The in-plane dielectric response of detwinned YBa$_{2}$Cu$_{3}$O$_{6.95}$ has been studied by far-infared ellipsometry. A surprisingly lare number of in-plane polarized modes are observed. Some of them correspond to pure phonon modes. Others posses 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 CDW state in the 1-d CuO chains and induced charge density fluctuations within the 2-d CuO$_{2}$ planes.

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