LINEAR-RESPONSE AND COLLECTIVE OSCILLATIONS IN SUPERCONDUCTORS WITH D-WAVE PAIRING

Simple equations for the linear response of layered superconductors wi th d-wave symmetry of the order parameter are derived by means of kine tic equations for Green's functions. Responses to solenoidal and poten tial electric fields have different frequency dependencies. The dampin g of plasma oscillation of superconducting electrons is determined by dielectric relaxation and is small. Relaxation of branch imbalance det ermined by elastic scattering is large enough to make the Carlson-Gold man mode in d-wave superconductors overdamped.