Anisotropic superconducting properties of aligned MgB2 crystallites
O. F. de Lima, R. A. Ribeiro, M. A. Avila, C. A. Cardoso, A. A. Coelho
Abstract
Samples of aligned MgB2 crystallites have been prepared, allowing for the first time the direct identification of an upper critical field anisotropy Hc2ab/Hc2c= xiab/xic ~ 1.73; with xio,ab ~ 70 A, xio,c ~ 40 A, and a mass anisotropy ratio mab/mc ~ 0.3. A ferromagnetic background signal was identified, possibly related to the raw materials purity.
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