Detection of Vortices by Quasiparticle Tunneling

Publisher Website
Google Scholar
Abstract
An SIS-tunnel junction was made using a niobium tip and a niobium sheet as electrodes. Stable normal resistances of the order of 0.1 to 100 kOhms could be obtained. Operating such junctions in the constant current mode a clearly visible modulation of the sum gap voltage Vsg could be detected caused by the passage of vortices across the contact area. In this experiment, with the tip position at rest, the variation of Vsg was induced by the motion of vortices that were driven either by a change of applied magnetic field or by an electric transport current of suitable magnitude in the niobium sheet. The results indicate on the other hand the feasibility of scanning tunneling microscopy of vortices at rest, using a suitable scanner for the tip electrode.

This publication has 0 references indexed in Scilit: