Nonlocal effects on the surface resistance of high-temperature superconductors with (100) and (110) surfaces

The low-temperature surface resistance R-s of d-wave superconductors is cal culated as function of frequency assuming normal state quasiparticle mean f ree paths l in excess of the penetration depth. Results depend strongly on the geometric configuration. In the clean limit, two contributions to R-s w ith different temperature dependencies are identified: photon absorption by quasiparticles and pair breaking. The size of nonlocal corrections, which can be positive or negative depending on frequency decreases for given I as the scattering phase shift delta(N) is increased. However, except in the u nitarity limit delta(N) = 0.5 pi, nonlocal effects should be observable.