On the Ginzburg-Landau Analysis of the Upper Critical Field Hc2 in MgB2

Details On the Ginzburg-Landau Analysis of the Upper Critical Field Hc2 in MgB2 On the Ginzburg-Landau Analysis of the Upper Critical Field Hc2 in MgB2

2001-12-12

arxiv.org/abs/cond-mat/0112210v1

Physics

Condensed Matter

Superconductivity

14 pages, 2 figures, submitted to SUST November 2001

Scientific paper

10.1088/0953-2048/15/2/102

Temperature dependence of the upper critical field Hc2 (T) for the superconducting magnesium diboride, MgB2, is studied in the vicinity of Tc by using a two-band Ginzburg-Landau (G-L) theory. The temperature dependence of Hc2 (T) near Tc exhibits a positive curvature. In addition, the calculated temperature dependence and its higher order derivatives are also shown to be in a good agreement with the experimental data. In analogy with the multi-band character of Eliashberg microscopic theory, the positive curvature of Hc2 (T) is described reasonably by solving the two-band of G-L theory.

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