Files
Document type
ArticleVersion
Published versionPublication date
All rights reserved
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/125588
Irreversible flow of vortex matter: polycrystal and amorphous phases
Journal Title
Director/Tutor
Journal ISSN
Volume Title
Related resource
Abstract
We investigate the microscopic mechanisms giving rise to plastic depinning and irreversible flow in vortex matter. The topology of the vortex array crucially determines the flow response of this system. To illustrate this claim, two limiting cases are considered: weak and strong disorder forces. In the first case disorder is strong enough to introduce plastic effects in the vortex lattice. Diffraction patterns unveil polycrystalline lattice topology with dislocations and grain boundaries determining the electromagnetic response of the system. Filamentary flow is found to arise as a consequence of dislocation dynamics. We analyze the stability of vortex lattices against the formation of grain boundaries, as well as the steady-state dynamics for currents approaching the depinning critical current from above, when vortex motion is mainly localized at the grain boundaries. On the contrary, a dislocation description proves no longer adequate in the second limiting case examined. For strong disorder forces, the vortex array appears completely amorphous and no remnant of the Abrikosov lattice order is left. Here we obtain the critical current as a function of impurity density, its scaling properties, and characterize the steady-state dynamics above depinning. The plastic depinning observed in the amorphous phase is tightly connected with the emergence of channel-like flow. Our results suggest the possibility of establishing a clear distinction between two topologically disordered vortex phases: the vortex polycrystal and the amorphous vortex matter.
Subject
Subject (English)
Citation
Citation
MORETTI, Paolo and MIGUEL LÓPEZ, María del Carmen. Irreversible flow of vortex matter: polycrystal and amorphous phases. Physical Review B. 2009. Vol. 80, num. 22, pags. 224513. ISSN 1098-0121. [consulted: 8 of June of 2026]. Available at: https://hdl.handle.net/2445/125588