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VOLUME 83, NUMBER 8 P H Y S I C A L R E V I E W L E T T E R S 23 AUGUST 1999 Flow Induced Organization and Memory of a Vortex Lattice
 

Summary: VOLUME 83, NUMBER 8 P H Y S I C A L R E V I E W L E T T E R S 23 AUGUST 1999
Flow Induced Organization and Memory of a Vortex Lattice
Z. L. Xiao and E. Y. Andrei
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855
M. J. Higgins
NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540
(Received 12 April 1999)
We report on the evolution of a vortex state in response to a driving current in 2H-NbSe2 crystals. By
using fast transport measurements we find that the current enables the system to reorganize and access
new configurations. During this process the system exhibits a long-term memory: if the current is turned
off the vortices freeze in place remembering their prior motion. When the current is restored the motion
resumes where it stopped. The experiments provide evidence for a current driven structural change of
the vortex lattice and a corresponding dynamic phase diagram that contains a previously unknown
regime where the critical current can be either increased or decreased by applying an appropriate
current.
PACS numbers: 74.60.Ge, 74.60.Ec, 74.60.Jg
Vortices in a type-II superconductor exhibit remarkably
rich and sometimes surprising collective behavior. The
underlying physics is a delicate balance between two
competing forces: one is the interaction between vortices,

  

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

 

Collections: Materials Science; Physics