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VOLUME 81, NUMBER 11 P H Y S I C A L R E V I E W L E T T E R S 14 SEPTEMBER 1998 Plastic Motion of a Vortex Lattice Driven by Alternating Current
 

Summary: VOLUME 81, NUMBER 11 P H Y S I C A L R E V I E W L E T T E R S 14 SEPTEMBER 1998
Plastic Motion of a Vortex Lattice Driven by Alternating Current
W. Henderson* 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 16 March 1998)
We have measured the response of the vortex system in the low Tc superconductor 2H-NbSe2 to finite
frequency drives. In a well-defined range of fields, temperatures, and driving amplitudes the system
exhibits novel nonlinear phenomena. Most strikingly, the vortices can move easily in response to
currents that are well below the dc critical current if the direction of the current is reversed periodically
while the amplitude I is kept fixed, but they do not respond to a current that periodically switches
between zero and I, while the direction is kept fixed. Pronounced memory effects associated with
these phenomena indicate the presence of dynamically generated structural changes in the vortex array.
[S0031-9007(98)07035-5]
PACS numbers: 74.70.Ad
The physics of a vortex array (VA) in low Tc super-
conductors is governed by the competition between vor-
tex interactions, which favor the formation of an ordered
hexagonal lattice, and pinning by a random distribution of

  

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

 

Collections: Materials Science; Physics