In-plane polarized collective modes in detwinned YBa2Cu3O6.95 observed by spectral ellipsometry

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Authors	BERNHARD C. HOLDEN T. HUMLÍČEK Josef MUNZAR Dominik GOLNIK A.
Year of publication	2002
Type	Article in Periodical
Magazine / Source	Solid state communications
MU Faculty or unit	Faculty of Science
Citation
Field	Solid matter physics and magnetism
Keywords	HIGH-TEMPERATURE SUPERCONDUCTORS; SINGLE-DOMAIN YBA2CU3O7; OPTICAL CONDUCTIVITY; ENERGY-GAP; STATE; SPECTROSCOPY; CRYSTAL
Description	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 a-b 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.
Related projects:	Physical properties of new materials and layered structures