On the Ginzburg-Landau Analysis of the Lower Critical Field Hc1 in MgB2

Details On the Ginzburg-Landau Analysis of the Lower Critical Field Hc1 in MgB2 On the Ginzburg-Landau Analysis of the Lower Critical Field Hc1 in MgB2

2002-01-08

arxiv.org/abs/cond-mat/0201112v1

Physics

Condensed Matter

Superconductivity

14 pages, 2 figures

Scientific paper

Temperature dependence of the lower critical field Hc1 (T) for the superconducting magnesium diboride, MgB2, is studied in the vicinity of Tc by using a two-band Ginzburg-Landau (G-L) theory. Theoretically calculated Hc1 (T) near Tc exhibits a negative curvature. The results are shown to be in a good agreement with the experimental data. In addition, two-band G-L theory calculations give a temperature dependence of the Ginzburg-Landau parameter, which varies little with temperature as in a similar manner of the microscopic single-band BSC theory.

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