Title: OPTICAL CONDUCTIVITY IN SUPERCONDUCTORS WITH MIXED SYMMETRY ORDER PARAMETERS
Authors: I.Schurrer, E.Schachinger (Institut fur Theoretische Physik, Technische Universitat Graz, Petersgasse 16, A-8010 Graz, Austria)

The real and imaginary part of the optical conductivity and the derived optical scattering rate of superconductors with mixed $s+d$ or $s+{\rm id}$ symmetry order parameter is calculated for different mixing and for moderate impurity concentrations in two limiting cases, namely the Born (weak) and the resonant (unitary) scattering limit. There are pronounced differences in the optical conductivity between impurity limits and with the symmetry of the order parameter. Theoretical predictions are compared to experimental data.

Comments: Figs. 7, Refs. 15, Tabs. 1.