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    Phys Rev Lett. 2004 Mar 12;92(10):107008. Epub 2004 Mar 12.

    Why magnesium diboride is not described by anisotropic Ginzburg-Landau theory.

    Source

    Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

    Abstract

    It is well established that the superconductivity in the recently discovered superconducting compound MgB2 resides in the quasi-two-dimensional band (sigma band) and three-dimensional band (pi band). We demonstrate that, due to such band structure, the anisotropic Ginzburg-Landau theory practically does not have a region of applicability, because gradient expansion in the c direction breaks down. In the case of a dirty pi band, we derive the simplest equations, which describe properties of such superconductors near Tc, and explore some consequences of these equations.

    PMID:
    15089235
    [PubMed]

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