Abstract
Superconductivity-induced structures in the electronic Raman spectra of high- superconductors are computed using the results of ab initio local-density approximation linear muffin-tin-orbital three-dimensional band-structure calculations via numerical integrations of the mass fluctuations, either in the whole three-dimensional Brillouin zone or limiting the integrations to the Fermi surface. The results of both calculations are rather similar, the Brillouin-zone integration yielding additional weak structures related to the extended van Hove singularities. Similar calculations have been performed for the normal state of these high- cuprates. Polarization configurations have been investigated and the results have been compared to experimental spectra. The assumption of a simple -like gap function allows us to explain a number of experimental features but is hard to reconcile with the relative positions of the and peaks.
DOI:https://doi.org/10.1103/PhysRevB.55.12725
©1997 American Physical Society