1994/08/12 by T. P. Devereaux, D. Einzel
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevb.51.16336
53 pages, Revtex, t.p.d
arxiv created 1994/08/12 · arxiv updated 2009/11/30
A gauge invariant theory for electronic Raman scattering for superconductors with anisotropic pairing symmetry is analyzed in detail. It is shown that Raman scattering in anisotropic superconductors provides a wealth of polarization-dependent information which probes the detailed angular dependence of the superconducting ground state order parameter. The Raman spectra shows a unique polarization dependence for various anisotropic pair- state symmetries which affects the peak position of the spectra and generates symmetry dependent low frequency and temperature power-laws which can be used to uniquely identify the magnitude and symmetry of the energy gap. In particular, we calculate the collective modes and the subsequent symmetry--dependent Raman spectra for a dx2-y2 superconductor and compare our results to the relevant data on the cuprate systems as well as theoretical predictions for s--wave, anisotropic s--wave and s+id energy gaps. Favorable agreement is shown with the predictions for dx2-y2 pairing and the experimental data on YBa2Cu3O7, Bi2Sr2CaCu2O8 and Tl2Ba2CuO6.