TITLE

Dynamics of single vortices in grain boundaries: I-V characteristics on the femtovolt scale

AUTHOR(S)
Kalisky, B.; Kirtley, J. R.; Nowadnick, E. A.; Dinner, R. B.; Zeldov, E.; Ariando; Wenderich, S.; Hilgenkamp, H.; Feldmann, D. M.; Moler, K. A.
PUB. DATE
May 2009
SOURCE
Applied Physics Letters;5/18/2009, Vol. 94 Issue 20, p202504
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We employed a scanning Hall probe microscope to detect the hopping of individual vortices between pinning sites along grain boundaries in YBa2Cu3O6+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.
ACCESSION #
40125761

 

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