Author/Authors :
Bernhard، نويسنده , , C. and Holden، نويسنده , , T. and Huml??cek، نويسنده , , J. and Munzar، نويسنده , , D. and Golnik، نويسنده , , A. and Kl?ser، نويسنده , , M. and Wolf، نويسنده , , Th. and Carr، نويسنده , , L. and Homes، نويسنده , , C. and Keimer، نويسنده , , B. and Cardona، نويسنده , , M.، نويسنده ,
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 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.
Keywords :
A. High-Tc superconductors , D. Dielectric response , D. Electron–phonon interactions , E. Light absorption and reflection
