Nonlocal Effects on the Surface Resistance of High-Temperature Superconductors with (100) and (110) Surfaces

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The low-temperature surface resistance Rs of d-wave superconductors is calculated as function of frequency assuming normal state quasiparticle mean free paths l in excess of the penetration depth. Results depend strongly on the geometric configuration. In the clean limit, two contributions to Rs with 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 l as the scattering phase shift δN is increased. However, except in the unitarity limit δN=0.5π, nonlocal effects should be observable.

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