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

Appl. Phys. Lett. 94, 202504 (2009); doi:10.1063/1.3137164

Published 19 May 2009

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B. Kalisky,1 J. R. Kirtley,1 E. A. Nowadnick,1 R. B. Dinner,1 E. Zeldov,1,2 Ariando,3 S. Wenderich,3 H. Hilgenkamp,3 D. M. Feldmann,4 and K. A. Moler1
1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
2Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel
3Low Temperature Division, Mesa+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
4Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
We employed a scanning Hall probe microscope to detect the hopping of individual vortices between pinning sites along grain boundaries in YBa2Cu3O6+delta 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[proportional]In with an unprecedented high exponent of n[approximate]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
History: Received 18 March 2009; accepted 24 April 2009; published 19 May 2009
Permalink: http://link.aip.org/link/?APPLAB/94/202504/1
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KEYWORDS and PACS

Keywords
PACS
  • 74.78.Bz
    High-Tc superconducting films
  • 74.25.Qt
    Vortex lattices, flux pinning, flux creep
  • 74.25.Fy
    Transport properties of superconductors
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (24)
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