Field Dependence of the Vortex Core Size in a Multiband Superconductor

F. D. Callaghan, M. Laulajainen, C. V. Kaiser, and J. E. Sonier
Phys. Rev. Lett. 95, 197001 – Published 1 November 2005

Abstract

The magnetic field dependence of the vortex core size in the multiband superconductor NbSe2 has been determined from muon spin rotation measurements. The spatially extended nature of the quasiparticle core states associated with the smaller gap leads to a rapid field-induced shrinkage of the core size at low fields, while the more tightly bound nature of the states associated with the larger gap leads to a field-independent core size for fields greater than 4 kOe. A simple model is proposed for the density of delocalized core states that establishes a direct relationship between the field-induced reduction of the vortex core size and the corresponding enhancement of the electronic thermal conductivity. We show that this model accurately describes both NbSe2 and the single-band superconductor V3Si.

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  • Received 31 May 2005

DOI:https://doi.org/10.1103/PhysRevLett.95.197001

©2005 American Physical Society

Authors & Affiliations

F. D. Callaghan1, M. Laulajainen1, C. V. Kaiser1, and J. E. Sonier1,2

  • 1Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
  • 2Canadian Institute for Advanced Research, 180 Dundas Street West, Toronto, Ontario M5G 1Z8, Canada

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Issue

Vol. 95, Iss. 19 — 4 November 2005

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