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Title: Crossover from intravalley to intervalley vortex motion in type-II superconductors with a periodic pinning array
Authors: Raedts, Sophie ×
Silhanek, Alejandro
Moshchalkov, Victor
Moonens, J
Leunissen, LHA #
Issue Date: May-2006
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:73 issue:17 pages:1-5
Conference: date:Katholieke Univ Leuven, Lab Solid State Phys & Magnetism, Nanoscale & Superconduct & Magnetism Grp, B-3001 Louvain, Belgium; IMEC VZW, B-3001 Louvain, Belgium
Article number: 174514
Abstract: We have determined the transition from intravalley vortex motion (Campbell regime) to intervalley motion (critical state regime) in Pb thin films with and without a square array of holes (antidots) by means of ac susceptibility chi(T,H) measurements. The Campbell regime is characterized by a maximum dissipation chi(')(max) dependent on the ac excitation h but nearly temperature independent. In contrast, in the critical state regime, the height of the dissipation peak remains constant, whereas its position shifts to lower temperatures with increasing h. We introduce an alternative way for determining the temperature dependence of the ac onset of the Bean critical state by analyzing the critical current density J(T) extracted from the chi(')(T) data at several h. We demonstrate that the presence of a periodic pinning array strongly affects the extension of the crossover area in the h-T diagram between these regimes. We show that this effect can be ascribed to the lower dispersion of the pinning energy together with the higher topological order for the antidot sample.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Tutorial services, Faculty of Science
Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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