Abstract
Microbridges with dimensions smaller than the London penetration depth λ have been prepared in epitaxial YBaCu2O7-δ 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.
| Original language | English |
|---|---|
| Pages (from-to) | 1525-1528 |
| Number of pages | 4 |
| Journal | Physical review letters |
| Volume | 70 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 1993 |