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|Title:||Dynamics of single vortices in grain boundaries: I-V characteristics on the femtovolt scale|
|Citation:||Kalisky, B., Kirtley, J.R., Nowadnick, E.A., Dinner, R.B., Zeldov, E., Ariando, Wenderich, S., Hilgenkamp, H., Feldmann, D.M., Moler, K.A. (2009). Dynamics of single vortices in grain boundaries: I-V characteristics on the femtovolt scale. Applied Physics Letters 94 (20) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3137164|
|Abstract:||We employed a scanning Hall probe microscope to detect the hopping of individual vortices between pinning sites along grain boundaries in YBa 2Cu3O6+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. © 2009 American Institute of Physics.|
|Source Title:||Applied Physics Letters|
|Appears in Collections:||Staff Publications|
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