Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2

Dahm T, Schopohl N (2003)
Physical Review Letters 91(1).

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Recent measurements of the anisotropy of the upper critical field B-c2 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 band structure 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 B-c2 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=T-c and quantitatively predict the distortion of the vortex lattice based on our calculations.
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Dahm T, Schopohl N. Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters. 2003;91(1).
Dahm, T., & Schopohl, N. (2003). Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters, 91(1).
Dahm, T., and Schopohl, N. (2003). Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters 91.
Dahm, T., & Schopohl, N., 2003. Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters, 91(1).
T. Dahm and N. Schopohl, “Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2”, Physical Review Letters, vol. 91, 2003.
Dahm, T., Schopohl, N.: Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2. Physical Review Letters. 91, (2003).
Dahm, Thomas, and Schopohl, N. “Fermi surface topology and the upper critical field in two-band superconductors: Application to MgB2”. Physical Review Letters 91.1 (2003).
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6 Citations in Europe PMC

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Temperature-dependent anisotropy of the penetration depth and coherence length of MgB2.
Fletcher JD, Carrington A, Taylor OJ, Kazakov SM, Karpinski J., Phys. Rev. Lett. 95(9), 2005
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Why magnesium diboride is not described by anisotropic Ginzburg-Landau theory.
Koshelev AE, Golubov AA., Phys. Rev. Lett. 92(10), 2004
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Anisotropies of the lower and upper critical fields in MgB2 single crystals.
Lyard L, Szabo P, Klein T, Marcus J, Marcenat C, Kim KH, Kang BW, Lee HS, Lee SI., Phys. Rev. Lett. 92(5), 2004
PMID: 14995332

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