Nonlinear Temperature Dependence of Magnetization of Two-Band Superconductors Near Upper Critical Field
Nonlinear Temperature Dependence of Magnetization of Two-Band Superconductors Near Upper Critical Field
摘要
Temperature dependence of the magnetization M （T） of two-band superconductors is studied in the vicinity of upper critical field He2 by using a two-band Ginzburg-Landau （GL） theory. It is shown that magnetization M（T） has a nonlinear character due to positive curvature of upper critical field Hc2（T） and temperature dependence of effective Ginzburg-Landau parameter Neff（T）. The results are shown to be in qualitative agreement with experimental data for the superconducting magnesium diboride, MgB2.
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