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Scanning SQUID microscopy of vortex clusters in multiband superconductors

Taichiro Nishio, Vu Hung Dao, Qinghua Chen, Liviu F. Chibotaru, Kazuo Kadowaki, and Victor V. Moshchalkov
Phys. Rev. B 81, 020506(R) – Published 19 January 2010

Abstract

In type-1.5 superconductors, vortices emerge in clusters, which grow in size with increasing magnetic field. These vortex clusters and their field dependence are directly visualized by scanning superconducting quantum interference device microscopy at very low vortex densities in MgB2 single crystals. Our observations are elucidated by simulations based on a two-gap Ginzburg-Landau theory in the type-1.5 regime.

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  • Received 22 October 2009

DOI:https://doi.org/10.1103/PhysRevB.81.020506

©2010 American Physical Society

Authors & Affiliations

Taichiro Nishio1, Vu Hung Dao1, Qinghua Chen1, Liviu F. Chibotaru1, Kazuo Kadowaki2, and Victor V. Moshchalkov1,*

  • 1Institute for Nanoscale Physics and Chemistry (INPAC), Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
  • 2Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan

  • *Corresponding author; victor.moshchalkov@fys.kuleuven.be

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Vol. 81, Iss. 2 — 1 January 2010

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