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Ginzburg-Landau theory: the case of two-band superconductors


Institute of Physics, National Academy of Sciences of Azerbaijan, prosp. H. Davida 33, Baku, 1143, Azerbaijan

Recent studies of two-band superconductors using the Ginzburg-Landau (GL) theory are reviewed. The upper and lower critical fields [Hc2(T) and Hc1(T), respectively], thermodynamic magnetic field Hcm(T), critical current density jc(T), magnetization M(T) near the upper critical field, and the upper critical field Hfilmc2(T) of thin films are examined from the viewpoint of their temperature dependence at a point Tc using the two-band GL theory. The results are shown to be in good agreement with the experimental data for the bulky samples of superconducting magnesium diboride, MgB2, and nonmagnetic borocarbides LuNi2B2C and YNi2B2C. The specific heat jump turns out to be smaller than that calculated by single-band GL theory. The upper critical field of thin films of two-band superconductors is calculated and the Little-Parks effect is analyzed. It is shown that magnetic flux quantization and the relationship between the surface critical magnetic field Hc3(T) and the upper critical field Hc2(T) are the same as in the single-band GL theory. Extension of the two-band GL theory to the case of layered anisotropy is presented. The anisotropy parameter of the upper critical field Hc2 and the London penetration depth λ, calculated for MgB2 single crystals, are in good agreement with the experimental data and show opposite temperature behavior to that in single-band GL theory.

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Fulltext is also available at DOI: 10.1070/PU2006v049n10ABEH006055
PACS: 74.20.De, 74.25.−q, 74.70.Ad (all)
DOI: 10.1070/PU2006v049n10ABEH006055
URL: https://ufn.ru/en/articles/2006/10/a/
000244185100001
2-s2.0-33847041105
2006PhyU...49.1003A
Citation: Askerzade I N "Ginzburg-Landau theory: the case of two-band superconductors" Phys. Usp. 49 1003–1016 (2006)
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Оригинал: Аскерзаде И Н «Теория Гинзбурга-Ландау для двузонных сверхпроводников» УФН 176 1025–1038 (2006); DOI: 10.3367/UFNr.0176.200610a.1025

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