1. Dynamics of single vortices in grain boundaries: I-V characteristics on the femtovolt scale.
- Author
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Kalisky, B., Kirtley, J. R., Nowadnick, E. A., Dinner, R. B., Zeldov, E., Ariando, Wenderich, S., Hilgenkamp, H., Feldmann, D. M., and Moler, K. A.
- Subjects
MICROSCOPES ,CRYSTAL grain boundaries ,THIN films ,CRYSTAL growth ,OPTICAL instruments - Abstract
We employed a scanning Hall probe microscope to detect the hopping of individual vortices between pinning sites along grain boundaries in YBa
2 Cu3 O6+δ thin films in the presence of an applied current. Detecting the motion of individual vortices allowed us to probe the current-voltage (I-V) characteristics of the grain boundary with voltage sensitivity below a femtovolt. We find a very sharp onset of dissipation with V∝In with an unprecedented high exponent of n≈290 that shows essentially no dependence on temperature or grain boundary angle. Our data have no straightforward explanation within the existing grain boundary transport models. [ABSTRACT FROM AUTHOR]- Published
- 2009
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