Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.17: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Characterization of Top-Seeded Melt-Grown Bulk Superconductors by Hall Probe Mapping Techniques — •S. Haindl1, H.W. Weber1, N. Hari Babu2, D. A. Cardwell2, S. Meslin3, J. Noudem3, L. Shlyk4, and G. Krabbes4 — 1Atomic Institute of the Austrian Universities, TU Vienna, Austria — 2IRC in Superconductivity, University of Cambridge, UK — 3CRISMAT-ENSICAEN, CNRS/UMR, France — 4IFW Dresden, Germany
We report on the characterization of top-seeded melt-grown (TSMG) single grain bulk superconductors by two Hall probe mapping techniques. Scanning the trapped field distribution following magnetization of the sample in an external field is an established method of characterizing these materials. This technique enables both determination of the maximum trapped field after complete field penetration of the bulk sample, and identification of growth-induced inhomogeneities within the sample microstructure. A new mapping technique known as Magnetoscan has been developed over the past two years and recently improved to yield more useful information about the quality of bulk superconductors. This technique involves scanning simultaneously a small permanent magnet and a Hall probe over the unmagnetized superconducting surface of the bulk sample. Interesting results have been obtained using the magnetoscan technique, including direct imaging of different growth sectors in bulk samples and the identification of inhomogeneities such as cracks and grain-boundaries and the mapping of artificial holes in the single grain microstructure.