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Flux line lattice states and pinning in niobium wire networks in high magnetic fields

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Abstract

The properties of the flux line lattice in the thin strands of superconducting niobium wire networks with thickness and width comparable to the penetration depth are investigated in the limit of very few flux lines. An angle dependent upper critical field is observed that is consistent with the existence of surface superconductivity. Our results indicate the existence of a flux line lattice in the complete field range Bc1 ⩽ B ⩽ Bc∥ ≃ 1.4 Bc2. The flux line lattice undergoes a dimensional crossover when the transversal correlation length Rc is of the order of the strand width. The field dependence of the Labusch parameter due to surface pinning is determined and compared to a model for surface pinning by Bean-Livingston barriers.

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Author notes

  1. M. Ziese

    Present address: Faculty of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, 1081, HV Amsterdam, The Netherlands

  2. P. Esquinazi

    Present address: Department of Superconductivity and Magnetism, University of Leipzig, Linnéstraße 5, D-04103, Leipzig, Germany

Authors and Affiliations

  1. Experimentalphysik V, Universität Bayreuth, D-95440, Bayreuth, Germany

    M. Ziese & P. Esquinazi

  2. Physikalisch-Technische Bundesanstalt, Institut Berlin, Abbestraβe 2–12, D-10587, Berlin

    S. Knappe & H. Koch

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  1. M. Ziese
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  2. P. Esquinazi
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  4. H. Koch
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Ziese, M., Esquinazi, P., Knappe, S. et al. Flux line lattice states and pinning in niobium wire networks in high magnetic fields. J Low Temp Phys 103, 71–106 (1996). https://doi.org/10.1007/BF00754658

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  • DOI: https://doi.org/10.1007/BF00754658

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