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Phys. Rev. Lett. 80, 381–384 (1998)

ac Dynamics of a Pinned Flux-Line Lattice

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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; published in the issue dated 12 January 1998

The surface impedance of 2H- NbSe2 in the mixed state was measured over the frequency range 10–3000 MHz in fields up to 2 T. A crossover between pinned and viscous flux-line dynamics is observed at a pinning frequency, ωp. The measured ωp is compared to that predicted by a single-particle “washboard potential” model of pinning. When the flux lattice is in an ordered state, ωp is in good agreement with the model. However, when it is in a metastable disordered state, ωp is nearly two orders of magnitude larger than expected, indicating the appearance of internal degrees of freedom and glassy dynamics.

© 1998 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.381
DOI:
10.1103/PhysRevLett.80.381
PACS:
74.60.Ge, 74.60.Ec, 74.60.Jg

*Current address: Department of Physics, University of California, Los Angeles, California 90024-1547.

 
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