Raman-scattering studies of coupled modes and superconducting gap excitations in single-crystal YBa_2Cu_3O_7-δ
- 1 March 1989
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America B
- Vol. 6 (3), 436-439
- https://doi.org/10.1364/josab.6.000436
Abstract
The results of polarized light-scattering studies of single-crystal YBa2Cu3O7-δ are presented. In the normal state, strong electronic scattering is observed both directly and through interference effects with certain phonons. Below Tc this electronic scattering undergoes a redistribution that is due to gap formation. The redistribution of the continuum below Tc has a strong symmetry dependence, suggesting possible gap anisotropy in YBa2Cu3O7-δ. Phonon self-energy effects are also shown to be consistent with gap anisotropy. Finally, studies of untwinned single crystals illustrate striking optical anisotropy of the Raman spectra in the a–b plane.Keywords
This publication has 9 references indexed in Scilit:
- Untwinned single crystals of : An optical investigation of the anisotropyPhysical Review B, 1988
- Phonon self-energy effects due to superconductivity: Evidence for the strong-coupling limit in YBa2Cu3O7-δSolid State Communications, 1988
- Frequencies, eigenvectors, and single-crystal selection rules of k=0 phonons in : Theory and experimentPhysical Review B, 1988
- Raman scattering from superconducting gap excitations in single-crystalPhysical Review B, 1988
- Spin fluctuations and superconductivity inPhysical Review Letters, 1988
- Raman detection of the superconducting gap in Ba-Y-Cu-O superconductorsPhysical Review B, 1987
- Temperature dependence of the Raman spectrum of the high Tc superconductor YBa2Cu3O7Solid State Communications, 1987
- Superconductivity at 93 K in a new mixed-phase Y-Ba-Cu-O compound system at ambient pressurePhysical Review Letters, 1987
- Theory of Raman scattering in superconductorsPhysical Review B, 1984