Self-consistent current-voltage characteristics of normal-superconductor interfaces
Open Access
- 19 June 1995
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 7 (25) , L317-L323
- https://doi.org/10.1088/0953-8984/7/25/002
Abstract
We study the nonlinear transport properties of NS (normal-superconductor) and NSN structures by means of a self-consistent microscopic description. A nonzero superfluid velocity causes the various quasiparticle channels within the S to open at different voltages. The gap reduction is very sensitive to the details of quasiparticle scattering. At low temperatures, superconductivity, sometimes in a peculiar gapless form, may survive up to voltages much higher that kBTc/e. The minimum voltage for quasiparticle transmission is shown to decrease strongly with temperature and with the transmittivity of the barrier.Keywords
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