Abstract
We report a Raman scattering investigation of superconducting gap anisotropy in single-crystal . Gap anisotropy is investigated by studying the peak in the low-temperature Raman continuum in various symmetries. Roughly a 35% difference in the energy of this peak is observed between different symmetries, suggesting the presence of substantial gap anisotropy. Anisotropy is further evidenced by the damping behavior of the 340- Raman-active phonon below , which displays increased attenuation due to phonon-induced pair breaking. The temperature dependence of this attenuation is consistent with a pair-breaking peak which is much larger than the 340- phonon in certain regions of the Fermi surface.
- Received 8 September 1988
DOI:https://doi.org/10.1103/PhysRevB.38.11934
©1988 American Physical Society