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In-plane polarized collective modes in detwinned YBa₂Cu₃O_(6.95) observed by spectral ellipsometry
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In-plane polarized collective modes in detwinned YBa₂Cu₃O_(6.95) observed by spectral ellipsometry
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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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