LT1027 - arrangement of singly quantized vortices and (ii)...

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Giant Vortex and Multivortex States in Mesoscopic Superconductors Akinobu Kanda a , Ben J. Baelus b , Francois M. Peeters b , Kazuo Kadowaki c , and Youiti Ootuka a a Institute of Physics and Tsukuba Research Center for Interdisciplinary Materials Science (TIMS), Uni- versity of Tsukuba, Tsukuba 305-8571, Japan b Department Fysica, Universiteit Antwerpen (Campus Middelheim), Groenenborgerlaan 171, B-2020 Antwerpen, Belgium c Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573, Japan Mesoscopic superconductors have sizes comparable to the superconducting coherence length and/or the magnetic penetration depth. The vortex con±guration in them is strongly a²ected not only by vortex- vortex interaction but also by the boundary, leading to corruption of the Abrikosov triangular lattice and formation of two kinds of fundamentally new vortex states; (i) multivortex states with a spatial
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Unformatted text preview: arrangement of singly quantized vortices and (ii) giant vortex states with a single multiply quantized vortex in the center. Here, we report on the experimental distinction between the giant vortex states and multivortex states in a disk, by using the multiple-small-tunnel-junction method, in which transport properties of several small tunnel junctions attached to the disk are measured simultaneously. More-over, we experimentally nd magnetic eld induced rearrangement and combination of vortices. The experimental results are well reproduced in numerical results based on the nonlinear Ginzburg-Landau theory. Sorting category: Be Superconductivity Keywords: mesoscopic superconductor, giant vortex states, multivortex states INVITED PAPER LT1027...
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