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Thermally activated depinning of a driven flux line lattice

Conference Paper


Abstract


  • 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 106 A/m2; (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.

Publication Date


  • 1999

Scopus Eid


  • 2-s2.0-0033242238

Start Page


  • 573

End Page


  • 578

Volume


  • 215

Issue


  • 1

Abstract


  • 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 106 A/m2; (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.

Publication Date


  • 1999

Scopus Eid


  • 2-s2.0-0033242238

Start Page


  • 573

End Page


  • 578

Volume


  • 215

Issue


  • 1