Physics – Condensed Matter
Scientific paper
1995-11-21
Physics
Condensed Matter
20 pages, RevTex, to appear in Phys. Rev. B, 6 figures on request at ivar@nuria.fmc.uam.es
Scientific paper
10.1103/PhysRevB.53.6693
Supercurrent flow is studied in a structure that in the Ginzburg-Landau regime can be described in terms of an effective double barrier potential. In the limit of strongly reflecting barriers, the passage of Cooper pairs through such a structure may be viewed as a realization of resonant tunneling with a rigid wave function. For interbarrier distances smaller than $d_0=\pi\xi(T)$ no current-carrying solutions exist. For distances between $d_0$ and $2d_0$, four solutions exist. The two symmetric solutions obey a current-phase relation of $\sin(\Delta\varphi/2)$, while the two asymmetric solutions satisfy $\Delta\varphi=\pi$ for all allowed values of the current. As the distance exceeds $nd_0$, a new group of four solutions appears, each contaning $(n-1)$ soliton-type oscillations between the barriers. We prove the inexistence of a continuous crossover between the physical solutions of the nonlinear Ginzburg-Landau equation and those of the corresponding linearized Schr\"odinger equation. We also show that under certain conditions a repulsive delta function barrier may quantitatively describe a SNS structure. We are thus able to predict that the critical current of a SNSNS structure vanishes as $\sqrt{T'_c-T}$, where $T'_c$ is lower than the bulk critical temperature.
Sols Fernando
Zapata Ivar
No associations
LandOfFree
Supercurrent flow through an effective double barrier structure 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 Supercurrent flow through an effective double barrier structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supercurrent flow through an effective double barrier structure will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-188101