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

Details Dynamics of single vortices in grain boundaries: I-V characteristics on the femto-volt scale Dynamics of single vortices in grain boundaries: I-V characteristics on the femto-volt scale

2009-03-19

arxiv.org/abs/0903.3262v1

Applied Physics Letters 94 202504 (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

We employed a scanning Hall probe microscope to detect the hopping of individual vortices between pinning sites along grain boundaries in YBCO 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 femto-volt. We find a very sharp onset of dissipation with V~I^n 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.

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