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Title: Anomalous field-dependence of the critical-current and flux-creep rate in Pb/Ge multilayers
Authors: Baert, M ×
Metlushko, VV
Temst, Kristiaan
Rosseel, E
Potter, CD
Snauwaert, Johan
Hellemans, Louis
Moshchalkov, Victor
Bruynseraede, Yvan #
Issue Date: Jan-1994
Publisher: Elsevier science bv
Series Title: Physica C vol:228 issue:1-2 pages:42-48
Abstract: Critical current densities J(c) and normalized flux creep rate S(= dln M/dln t) have been measured as a function of the perpendicular field H(perpendicular-to) in low-T(c) Pb/Ge multilayers, which can be used to model the superconducting properties of the layered high-T(c) cuprates. By taking a proper Ge separator thickness a field-induced crossover between two different pinning regimes can be observed. This transition leads to an anomalous behavior of J(c)(H(perpendicular-to)) and S(H(perpendicular-to)) in Pb/Ge multilayers, while a single Pb film demonstrates a monotonic suppression of J(c) by H(perpendicular-to). These data have been analyzed in the framework of the collective pinning (CP) theory of magnetically coupled superconducting planes: the J(c)(H(perpendicular-to)) anomaly is interpreted as a crossover from three-dimensional (3D) flux lines in low fields to two-dimensional (2D) pancake vortices in higher fields. This interpretation has also been confirmed by the suppression of the J(c)(H(perpendicular)) anomaly in the Pb/Ge multilayers with a square lattice of holes, forming additional defects for the confinement of the flux lines and for the expansion of the 3D regime.
URI: 
ISSN: 0921-4534
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Chemistry - miscellaneous
Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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