DOPING AND VANHOVE SINGULARITY DEPENDENCE OF RAMAN BACKGROUND IN D(X(2)-Y(2)) SUPERCONDUCTORS

In a two-dimensional band-structure model, the effect of doping on the Raman electronic background of a superconductor with d(x2-y2) gap sym metry is studied. Emphasis is placed near optimum doping and on the ro le of the van Hove singularity. The relationship between peaks in the Raman spectrum for three often discussed photon geometries and the gap is studied. No simple relationship exists, although the B-1g mode can show many of the features of the quasiparticle density of states.