Temperature Dependence of the Riedel Singularity
The amplitude of the Josephson supercurrent in a superconducting tunnel junction is voltage (or frequency) dependent. Riedel1 has shown theoretically that within the simple BCS model the amplitude diverges logarithmically at a voltage V = 2Δ/e(Δ is the BCS gap parameter). In practice, however, this Riedel singularity in the supercurrent amplitude is rounded off by quasiparticle damping2,3 and gap anisotropy effects.4 It thus provides an experimental probe of these effects.
KeywordsSuperconducting Tunnel Junction Residual Resistivity Ratio Tunneling Matrix Element Quasiparticle Tunnel Pair Tunneling
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