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VOLUME 80, NUMBER 2 P H Y S I C A L R E V I E W L E T T E R S 12 JANUARY 1998 ac Dynamics of a Pinned Flux-Line Lattice
 

Summary: VOLUME 80, NUMBER 2 P H Y S I C A L R E V I E W L E T T E R S 12 JANUARY 1998
ac Dynamics of a Pinned Flux-Line Lattice
W. Henderson* and E. Y. Andrei
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855
M. J. Higgins and S. Bhattacharya
NEC Research Institute, 4 Independence Way, Princeton, New Jersey 08540
(Received 5 March 1997)
The surface impedance of 2H-NbSe2 in the mixed state was measured over the frequency range
103000 MHz in fields up to 2 T. A crossover between pinned and viscous flux-line dynamics is
observed at a pinning frequency, vp. The measured vp is compared to that predicted by a single-
particle "washboard potential" model of pinning. When the flux lattice is in an ordered state, vp is in
good agreement with the model. However, when it is in a metastable disordered state, vp is nearly two
orders of magnitude larger than expected, indicating the appearance of internal degrees of freedom and
glassy dynamics. [S0031-9007(97)04967-3]
PACS numbers: 74.60.Ge, 74.60.Ec, 74.60.Jg
Pinning of the magnetic flux-line lattice (FLL) due to
material disorder plays an important role in the transport
properties of type-II superconductors [1]. When pinning
prevents the FLL from moving, dc transport is nondissipa-
tive and screening of electromagnetic fields is enhanced.

  

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

 

Collections: Materials Science; Physics