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Title: DETERMINATION OF THE SPATIAL LENGTH SCALE OF THE MAGNETIC-FIELD DISTRIBUTION IN YBA2CU3O7 CERAMICS AND BI2SR2CACU2O8 CRYSTAL
Authors: BONTEMPS, N ×
BERTIN, PY
DAVIDOV, D
MONOD, P
LACOUR, C
EVEN, R
Moshchalkov, Victor #
Issue Date: 1991
Publisher: ELSEVIER SCIENCE BV
Series Title: Physica. C, Superconductivity vol:185 issue:Part 3 pages:1809-1810
Conference: date:ECOLE SUPER PHYS & CHIM IND VILLE PARIS,F-75231 PARIS 05,FRANCE; MOSCOW MV LOMONOSOV STATE UNIV,MOSCOW 117234,RUSSIA
Abstract: We have measured the EPR linewidth of a free radical layer as a function of height (0.28 to 10-mu-m) above the surface of an YBa2Cu3O7 superconducting ceramic. We find characteristic lengthscales of the order of 20-40-mu-m for the field distribution at the surface. This result rules out the Abrikosov vortex lattice as the main source of surface EPR broadening, which we assign to extrinsic sources such as the grain structure. In contrast, the width of the free radical line, when deposited on the surface of a Bi2Sr2CaCu2O8 single crystal, exhibits a significant broadening only below the temperature where irreversibility sets in.
ISSN: 0921-4534
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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