Physics – Condensed Matter – Superconductivity
Scientific paper
2001-07-02
Superconductor Science and Technology 15(2002)202
Physics
Condensed Matter
Superconductivity
3 pages, 6 figures, text updated, new references included and discussed. Submitted to Superconductor Science and Technology
Scientific paper
10.1088/0953-2048/15/2/303
Bulk samples of MgB2 have been formed by hot isostatic pressing (HIPping) of commercial powder at 100MPa and 950=B0C. The resulting material is 100% dense with a sharp superconducting transition at 37.5K. Microstructural studies have indicated the presence of small amounts of second phases within the material, namely MgO and B rich compositions, probably MgB4. Magnetisation measurements performed at 20K have revealed values of Jc=1.3 x 106A/cm2 at zero field, and 9.3 x 105A/cm2 at 1T. Magneto optical (MO) studies have shown direct evidence for the superconducting homogeneity and strong intergranular current flow in the material.
Abell Stuart J.
Holdom D.
Kawano Kenro
Shields T. C.
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