Non-universality of Ginzburg-Landau Anisotropy of MgB2

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  • 10 December 2001
Abstract
The anisotropy of the upper critical field of MgB2$ high quality single crystals was determined by torque magnetometry in a wide range of temperatures. Hc2 anisotropy was found to be temperature dependent, varying between 6 at 15 K and 2.8 at 35 K. Fitting of reversible torque data measured near Tc to a formula based on the anisotropic London model indicates a field dependence of the Ginzburg-Landau anisotropy. A temperature or field dependence of the anisotropy cannot be attributed to the anisotropy of the band effective mass. In MgB2, it may be related to the anisotropy of the energy gap.

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