Physics – Condensed Matter – Superconductivity
Scientific paper
2007-06-19
Physica E 40 (2007) 184--186
Physics
Condensed Matter
Superconductivity
3 text pages, 1 page figure captions, 4 figures (one per page)
Scientific paper
10.1016/j.physe.2007.05.021
It is shown that in a structure consisting of a superconducting ring-shaped electrode overlapped by a normal metal contact through a thin oxide barrier, measurements of the tunnel current in magnetic field can probe persistent currents in the ring. The effect manifests itself as periodic oscillations of the tunnel current through the junction at a fixed bias voltage as function of perpendicular magnetic field. The magnitude of oscillations depends on bias point. It reaches maximum at energy eV which is close to the superconducting gap and decreases with increase of temperature. The period of oscillations dF in units of magnetic flux is equal neither to h/e nor to h/2e, but significantly exceeds these values for larger loop circumferences. The phenomenon is explained by formation of metastable states with large vorticity. The pairing potential and the superconducting density of states are periodically modulated by the persistent currents at sub-critical values resulting in corresponding variations of the measured tunnel current.
Arutyunov Yu. K.
Hongisto Terhi T.
Vodolazov Denis Yu.
No associations
LandOfFree
Tunneling spectroscopy of persistent currents in superconducting microrings 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 Tunneling spectroscopy of persistent currents in superconducting microrings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tunneling spectroscopy of persistent currents in superconducting microrings will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-281644