In-plane polarized collective modes in detwinned YBa${}_2$Cu${}_3$O${}_{6.95}$ observed by spectral ellipsometry

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.

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