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VOLUME 86, NUMBER 11 P H Y S I C A L R E V I E W L E T T E R S 12 MARCH 2001 Depinning of a Metastable Disordered Vortex Lattice
 

Summary: VOLUME 86, NUMBER 11 P H Y S I C A L R E V I E W L E T T E R S 12 MARCH 2001
Depinning of a Metastable Disordered Vortex Lattice
Z. L. Xiao and E. Y. Andrei
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855
P. Shuk and M. Greenblatt
Department of Chemistry, Rutgers University, Piscataway, New Jersey 08855
(Received 5 July 2000)
We report on experiments investigating the depinning dynamics of a strongly pinned vortex lattice in
2H-NbSe2. We find that the depinning process starts at currents that are well below the critical current
of the entire lattice and that it is governed by the formation of contiguous channels of mobile vortices
connecting the sample edges. We obtain the formation time of the first channel by monitoring the delayed
voltage response to a driving current step and by measuring the ramping rate dependence of the critical
current. The subsequent increase in the number of moving vortices is determined from the temporal
evolution of the voltage response and the critical current.
DOI: 10.1103/PhysRevLett.86.2431 PACS numbers: 74.60.Ge, 74.60.Ec, 74.60.Jg
Pinning of vortices in type II superconductors is crucial
for dissipationless transport. As long as the applied current
is sufficiently low, the vortices are immobile and the super-
conducting properties are maintained. But as the current is
increased beyond a critical value the vortices become un-

  

Source: Andrei, Eva Y. - Department of Physics and Astronomy, Rutgers University

 

Collections: Materials Science; Physics