Anisotropy in the upper and lower critical fields of MgB2 single crystals

MgB2 single crystals with a sharp transition width (DeltaTc0.3 K) were grown by the ambient-pressure synthesis. The upper and lower critical fields, Hc2 and Hc1 were evaluated from the magnetization for the applied field mu0H5 T parallel to the three crystallographic directions. The coherence length...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2004-10, Vol.412-414, p.258-261
Main Authors: Bando, H., Yamaguchi, Y., Shirakawa, N., Yanagisawa, T.
Format: Article
Language:English
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Summary:MgB2 single crystals with a sharp transition width (DeltaTc0.3 K) were grown by the ambient-pressure synthesis. The upper and lower critical fields, Hc2 and Hc1 were evaluated from the magnetization for the applied field mu0H5 T parallel to the three crystallographic directions. The coherence length &D*x and the penetration depth lambda for each direction were deduced from these critical fields with a little assumption for Hc1. The anisotropy ratio gammaH=&D*xc/&D*xab was estimated to be 6.5 at 2.5 K and 2.3 near Tc (=37.6 K), and gammalambda=lambdac/lambdaab(=3.0+/-0.2) to be almost constant over the range 2.5 KT < Tc.
ISSN:0921-4534
DOI:10.1016/j.physc.2004.01.055