Low-Temperature Anomaly in the Josephson Critical Current of Junctions in d-Wave Superconductors
Yu. S. Barash, H. Burkhardt, D. Rainer
DOI 10.1103/PhysRevLett.77.4070 · Physical Review Letters
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Abstract
We show that the Josephson critical current increases rapidly with decreasing temperature near T=0 for tunnel junctions between anisotropic superconductors. The enhancement of the critical current has its physical origin in the midgap states bound to the tunnel barrier. The magnitude of the zero-temperature peak in a realistic junction is shown to be sensitive to the barrier transparency and barrier roughness. For some crystal orientations we find a transition from a traditional 0 junction to the unconventional π junction with decreasing temperature.
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