Abstract
A cellular superconducting material consisting of thin (1–20 μm) MgB2−x layers and magnesium granules of about 100 μm has been produced. The critical temperature T c of this superconductor decreases with the thickness of the MgB2−x layers. In unalloyed magnesium diboride, the curvature of the temperature dependence of the upper critical field H c2(T) changes gradually from downward to pronounced upward as the temperature T c decreases from 38 to 36 K.
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Original Russian Text © V.A. Grinenko, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 85, No. 12, pp. 756–760.