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

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Koshelev, A.E. and Golubov, A.A. (2004) Why magnesium diboride is not described by anisotropic Ginzburg-Landau theory. Physical Review Letters, 92 (10). p. 107008. ISSN 0031-9007

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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.
Item Type:Article
Copyright:© 2004 The American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/47768
Official URL:http://dx.doi.org/10.1103/PhysRevLett.92.107008
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Metis ID: 218651