Dynamics of vortex glass phase in strongly type-II superconductors
Qing-Hu Chen
DOI 10.1103/PhysRevB.78.104501 · Physical Review B
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Abstract
Dynamics of vortices in strongly type-II superconductors with strong disorder is investigated within the frustrated three-dimensional XY model. For two typical models byOlsson [Phys. Rev. Lett. 91, 077002 (2003)] and Kawamura [Phys. Rev. B 68, 220502(R) (2003)], strong evidence for the finite temperature vortex glass transition in the unscreened limit is provided by performing large-scale dynamical simulations. The obtained correlation length exponents and the dynamic exponents in both models are different from each other and from those in the three-dimensional gauge glass model. In addition, a genuine continuous depinning transition is observed at zero temperature for both models. A scaling analysis for the thermal rounding of the depinning transition shows a non-Arrhenius type creep motion in the vortex glass phase, contrarily to the recent studies.
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