Abstract
We study the temperature dependence of the Josephson critical current for different symmetries of the superconducting state. We generalize Zaitsev's model for a smooth interface to include diffuse scattering of quasiparticles at the boundary. For d-wave symmetry, we find strong deviations from the Ambegaokar-Baratoff (AB) formula for SIS junctions. Similar results are obtained for s-wave superconductiors provided one assumes large pair-breaking effects at the interface (inelastic scattering, magnetic scattering, etc.). Our numerical calculations are able to explain experimental data measured on single grain boundary junctions as well as c-axis oriented granular films of high-temperature superconductors (HTSC).
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This work was supported by the SFB 279 (Wechselspiel zwischen Ordnung und Transport).
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Burkhardt, H., Rainer, D. & Widder, W. Effects of grain boundaries on the critical current of high-Tc superconductors. Czech J Phys 46 (Suppl 2), 1027–1028 (1996). https://doi.org/10.1007/BF02583821
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DOI: https://doi.org/10.1007/BF02583821