Physics – Condensed Matter – Superconductivity
Scientific paper
1999-03-23
Physics
Condensed Matter
Superconductivity
8 pages, 5 Postscript figures, submitted to Low Temp. Phys
Scientific paper
10.1063/1.593722
Specific features of the equilibrium current-carrying state of a Josephson tunnel junction between diffusive superconductors are studied theoretically in the 1D geometry. It is found that the Josephson current induces localized states of electron excitations in the vicinity of the tunnel barrier, which are a continuous analog of Andreev levels in a ballistic junction. The depth of the corresponding ``potential well'' is much greater than the separation between an Andreev level and the continuous energy spectrum boundary for the same transmissivity of the barrier. In contrast to a ballistic junction in which the Josephson current is transported completely by localized excitations, the contribution to current in a diffusive junction comes from whole spectral region near the energy gap boundary, where the density of states differs considerably from its unperturbed value. The correction to the Josephson current in the second order of the barrier transmissivity, which contains the second harmonic of the phase jump, is calculated and it is found that the true expansion parameter of the perturbation theory for a diffusive junction is not the tunneling probability $\Gamma$ itself, but a much larger parameter $W = (3\xi_0/4l)\Gamma$.
Bezuglyi E. V.
Bratus' E. N.
Galaiko V. P.
No associations
LandOfFree
On the theory of Josephson effect in a diffusive tunnel junction does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the theory of Josephson effect in a diffusive tunnel junction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the theory of Josephson effect in a diffusive tunnel junction will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-431918