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Coherent vortex motion in superconductors

Grzegorz Jung

Superconducting quantum phase coherence gives rise to a variety of macroscopic quantum phenomena, among them to the Josephson effects. Due to extremely short coherence length, voltages appearing across high-TC superconducting microbridges are not related to Josephson effects but to the motion of current-created vortices. Josephson-like effects may however appear in relatively large high-TC bridges due to the coherence in current driven vortex flow. To enforce the coherent regime we employ laser written channels of easy vortex motion in c-axis oriented YBCO thin films, and heavy ion irradiated channels in BSCCO single crystals. The project is supported by the Israeli Science Foundation grant.
 

Figure 1: Schematic of the layout of bridge with laser written channel for easy vortex motion. Figure 2: Magneto-optical image of field penetration into a laser written channel in the bridge constriction. Bright areas mark high magnetic field.



 

Further details will be available soon at Prof. Jung's web site.