Physics – Condensed Matter – Superconductivity
Scientific paper
1998-09-22
Physics
Condensed Matter
Superconductivity
4 pages, 1 eps figure, REVTEX
Scientific paper
Effect of surface pair breaking, entirely neglected by M. Samanta and S. Datta [Phys. Rev. B v. 57, 10972 (1998)], is quite important in considering surface (or interface) quasiparticle bound states and associated characteristics of junctions involving unconventional superconductors. The whole class of bound states with nonzero energy is simply omitted within the framework of the approach, using uniform spatial profile of the order parameter up to the interface. The contribution of these bound states (as well as midgap states) to current-voltage characteristics of the SIS' tunnel junctions were studied for the first time in our earlier article. Dependence of midgap state contribution to the Josephson critical current upon crystal to interface orientations is shown as well to be fairly sensitive to the effect of surface pair breaking.
Barash Yu. S.
Svidzinsky Anatoly A.
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