All-MgB2 Josephson tunnel junctions

Superelliptic Josephson Tunnel Junctions

The most important practical characteristic of a Josephson junction is its critical current. The shape of the junction determines the specific form of the magnetic-field dependence of the its Josephson current. Here we address the magnetic diffraction patterns of specially shaped planar Josephson tunnel junctions. We focus on a wide ensemble of generalized ellipses, called superellipses, which ...

Josephson Effects in MgB2 Metal Masked Ion Damage Junctions

We have successfully fabricated high quality Josephson junctions in MgB2 thin films by a combination of 30 kV focused Ga ion beam nanolithography and 50 keV proton ion beam irradiation. The junctions show resistively shunted junction like current—voltage characteristics with additional excess current. Monte Carlo simulation results for the optimized mask structure and experimental results for t...

All-carbon molecular tunnel junctions.

This Article explores the idea of using nonmetallic contacts for molecular electronics. Metal-free, all-carbon molecular electronic junctions were fabricated by orienting a layer of organic molecules between two carbon conductors with high yield (>90%) and good reproducibility (rsd of current density at 0.5 V <30%). These all-carbon devices exhibit current density-voltage (J-V) behavior simila...

Spatial dependence of plasma oscillations in Josephson tunnel junctions.

Long Josephson tunnel junctions with doubly connected electrodes