Magnetic probe microscopy; Pearl penetration depth; Nanostructured superconductors
Abstract :
[en] 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 λL coincides with the values previously reported for bulk Pb once the kinetic suppression of the order parameter is properly taken into account.
Disciplines :
Physics
Author, co-author :
Brisbois, Jérémy ; Université de Liège - ULiège > Département de physique > Physique de la matière condensée
Raes, Bart; Katholieke Universiteit Leuven - KUL
Van de Vondel, Joris; Katholieke Universiteit Leuven - KUL
Moshchalkov, Victor V.; Katholieke Universiteit Leuven - KUL
Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique de la matière condensée
Language :
English
Title :
Determination of the magnetic penetration depth in a superconducting Pb film
Publication date :
12 March 2014
Journal title :
Journal of Applied Physics
ISSN :
0021-8979
eISSN :
1089-7550
Publisher :
American Institute of Physics, Melville, United States - New York
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