Comparative Study of Dense Bulk MgB2 Materials Prepared by Different Methods |
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| Authors: | V. N. Narozhnyi, G. Fuchs, A. Handstein, A. Gü mbel, J. Eckert, K. Nenkov, D. Hinz, O. Gutfleisch, A. Wä lte, L. N. Bogacheva, I. E. Kostyleva, K.-H. Mü ller L. Schultz |
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| Affiliation: | (1) Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, P. O. Box 270116, D-01171 Dresden, Germany;(2) Department of Low Temperature Physics, Institute for High Pressure Physics Russian Academy of Sciences, Troitsk, 142190 Moscow Reg., Russia |
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| Abstract: | We report on the results of a comparative investigation of highly dense bulk MgB2 samples prepared by three methods: (i) hot deformation; (ii) high pressure sintering; and (iii) mechanical alloying of Mg and B powders with subsequent hot compaction. All types of samples were studied by AC susceptibility, DC magnetization, and resistivity measurements in magnetic fields up to  0H = 160 kOe. A small but distinct anisotropy of the upper critical field  connected with some texture of MgB2 grains was found for the hot deformed samples. The samples prepared by high pressure sintering as well as by mechanical alloying show improved superconducting properties, including high upper critical fields Hc2 (0Hc2 (0)  23 T), irreversibility fields Hirr which are strongly shifted towards higher values Hirr(T) 0.8 Hc2(T) and high critical current Jc (Jc = 105 A/cm2 at 20 K and 1 T). |
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| Keywords: | MgB2 upper critical field irreversibility field critical current |
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