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Title: Determination of the magnetic penetration depth in a superconducting Pb film

By means of scanning Hall probe microscopy technique, we accurately map the magnetic field pattern produced by Meissner screening currents in a thin superconducting Pb stripe. The obtained field profile allows us to quantitatively estimate the Pearl length Λ without the need of pre-calibrating the Hall sensor. This fact contrasts with the information acquired through the spatial field dependence of an individual flux quantum where the scanning height and the magnetic penetration depth combine in a single inseparable parameter. The derived London penetration depth λ{sub L} coincides with the values previously reported for bulk Pb once the kinetic suppression of the order parameter is properly taken into account.
Authors:
;  [1] ; ; ;  [2]
  1. Département de Physique, Université de Liège, B-4000 Sart Tilman, Liège (Belgium)
  2. INPAC–Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group, K.U. Leuven, Celestijnenlaan 200D, B–3001 Leuven (Belgium)
Publication Date:
OSTI Identifier:
22277903
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; HALL EFFECT; LEAD; MAGNETIC FIELDS; MEISSNER-OCHSENFELD EFFECT; MICROSCOPY; ORDER PARAMETERS; PENETRATION DEPTH; SUPERCONDUCTING FILMS; SUPERCONDUCTIVITY; SUPERCONDUCTORS