Physics – Condensed Matter – Superconductivity
Scientific paper
2002-12-09
Phys. Rev. Lett. 91, 017001 (2003)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, typos removed, minor changes, to appear in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.91.017001
Recent measurements of the anisotropy of the upper critical field Bc2 on MgB2 single crystals have shown a puzzling strong temperature dependence. Here, we present a calculation of the upper critical field based on a detailed modeling of bandstructure calculations that takes into account both the unusual Fermi surface topology and the two gap nature of the superconducting order parameter. Our results show that the strong temperature dependence of the Bc2 anisotropy can be understood as an interplay of the dominating gap on the sigma-band, which possesses a small c-axis component of the Fermi velocity, with the induced superconductivity on the pi-band possessing a large c-axis component of the Fermi velocity. We provide analytic formulas for the anisotropy ratio at T=0 and T=Tc and quantitatively predict the distortion of the vortex lattice based on our calculations.
Dahm Thomas
Schopohl Nils
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