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Thermally Activated Depinning of a Driven Flux Line Lattice
Author(s) -
Pan A. V.,
Esquinazi P.,
Lorenz M.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<573::aid-pssb573>3.0.co;2-8
Subject(s) - dissipation , condensed matter physics , materials science , electrical resistivity and conductivity , lattice (music) , flux (metallurgy) , line (geometry) , physics , thermodynamics , quantum mechanics , acoustics , metallurgy , geometry , mathematics
We have performed simultaneous measurements of the resonance frequency, damping and resistivity of vibrating Y123 thin films to study the behavior of the depinning of a driven flux line lattice (FLL). The measurements show: (i) the depinning temperature remains unaffected up to a current density of 10 6 A/m 2 ; (ii) at higher currents the depinning temperature and the width of the dissipation peak as a function of temperature decrease whereas its height increases; (iii) at high enough currents the dissipation at the depinning saturates. The observed “motional narrowing” appears to be in agreement with recently published ideas on a driven FLL with disorder recovering a quasi‐ordered or “Bragg‐glass” state by sliding it at high enough velocities. The dissipation peak measured at high currents can be quantitatively understood with a diffusion model without free parameters.