Thermally activated coherent vortex motion in YBa2Cu3O(7-delta) thin film microbridges

Microbridges with dimensions smaller than the London penetration depth have been prepared in epitaxial YBaCu2O(7-delta) thin films by means of electron beam lithography. Typical peaks and kinks are observed in their differential resistance versus current characteristics which can be attributed to coherent flux motion. A vortex activation energy proportional to the inverse current 1/I is obtained. Both the current and the temperature dependence of the activation energy are consistent with the collective flux creep model if the dimensionality of the elastic vortex lattice equals 2. (Author)