paper

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

arXiv:cond-mat/0107575 · doi:10.1016/S0038-1098(01)00451-3

Abstract

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.

In-plane polarized collective modes in detwinned YBa2​Cu3​O6.95​ observed by spectral ellipsometry

Abstract

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