Upper critical field of cellular magnesium diboride

  title={Upper critical field of cellular magnesium diboride},
  author={Vladimir A. Grinenko},
  journal={JETP Letters},
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 Tc 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 Hc2(T) changes gradually from downward to pronounced upward as the temperature Tc decreases from 38 to 36 K. 

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