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In-plane polarized collective modes in detwinned YBa2Cu3O6.95 observed by spectral ellipsometry
Institution:1. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany;2. Institute of Condensed Matter Physics, Masaryk University, Kotlářská 2, CZ-61137 Brno, Czech Republic;3. Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681, Warsaw, Poland;4. Forschungszentrum Karlsruhe, ITP, D-76021 Karlsruhe, Germany;5. National Synchrotron Light Source, Brookhaven National Laboratory, USA;1. Lebedev Physical Institute of the Russian Academy of Sciences, Leninskij prospekt, 53, 119991 Moscow, Russia;2. Department of Radiation and Chemical Physics, Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic;3. Laser Plasma Department, Institute of Plasma Physics, Czech Academy of Sciences, Za Slovankou 3, 182 00 Prague 8, Czech Republic;4. Joint Institute for Nuclear Research, Joliot-Curie 6, 141980 Dubna, Moscow Region, Russia;5. National Research Center “Kurchatov Institute”, Kurchatov Sq. 1, 123182 Moscow, Russia;1. CSIR- National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India;2. Academy of Scientific and Innovative Research (AcSIR), CSIR-NPL Campus, Dr. K.S. Krishnan Road, New Delhi, 110012, India;3. Department of Applied Physics, Delhi Technological University, Delhi, 110042, India;4. Solid State Physics Laboratory, Timarpur, Lucknow Road, Delhi, 110054, India;1. INFLPR - National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Str., Magurele RO-077125, Bucharest, Romania;2. UB - University of Bucharest, Faculty of Chemistry, 90-92 Şoseaua Panduri, Sector 5, RO-010184, Bucharest, Romania;3. UB - University of Bucharest, Faculty of Physics, 405 Atomistilor Str., Magurele RO-077125, Bucharest, Romania
Abstract: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 ab 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.
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