Limits of the upper critical field in dirty two-gap superconductors
By A. Gurevich. 2007
156 citations recorded by the source corpus.
Abstract An overview of the theory of the upper critical field in dirty two-gap superconductors, with a particular emphasis on MgB2 is given. We focus here on the maximum Hc2 which may be achieved by increasing intraband scattering, and on the limitations imposed by weak interband scattering and paramagnetic effects. In particular, we discuss recent experiments which have demonstrated tenfold increase of Hc2 in dirty carbon-doped films as compared to single crystals, so that Hc2(0) parallel to the ab planes may approach the BCS paramagnetic limit, Hp [T] = 1.84Tc [K] ≃ 60–70 T. New effects produced by weak interband scattering in the two-gap Ginzburg–Landau equations and features of Hc2(T) in ultrathin MgB2 films are addressed.
Subfields: Biomedical Engineering, Condensed Matter Physics
View Paper: https://www.semanticscholar.org/paper/af03afa7925e859d1bcc6b40e876e6c6c8b18233
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In Biomedical Engineering
In Condensed Matter Physics
Citations in the corpus
- Two-band superconductor magnesium diboride (2008, background): “In particular, this is attributed to the dirtier π bands in Mg(B1−xCx)2 samples [128, 205].”
- Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11 (2008, result): “For field along the ab plane, the parameter h should be replaced with h = D2/[D1(ab)D1(c) ]1/2, allowing strong anisotropy D1(ab) >> D1(c) to significantly increase h for B||ab as compared to B||c [21].”
- Superconductivity in few-layer stanene (2017, methodology): “To fit upper critical field as a function of temperature in the two-band regime, we employ the formula [27]:”
- Iron-based superconductors at high magnetic fields (2011, background): “For the s++ pairing at | ln η| 2λ0/w, the value of Hc2(0) ∝ v−2 2 is limited by the smaller Fermi velocity in band 2, and Hc2(0) is cut off by the paramagnetic pairbreaking and interband impurity scattering as v2 → 0 [117].”