Magnetism, superconductivity, and pairing symmetry in iron-based superconductors
TLDR
In this paper, the antiferromagnetism and superconductivity in novel Fe-based superconductors were analyzed in the itinerant model of small electron and hole pockets near 0,0 and, respectively, and the effective interactions in both channels logarithmically flow toward the same values at low energies.Abstract:
We analyze antiferromagnetism and superconductivity in novel Fe-based superconductors within the itinerant model of small electron and hole pockets near 0,0 and ,. We argue that the effective interactions in both channels logarithmically flow toward the same values at low energies; i.e., antiferromagnetism and superconductivity must be treated on equal footing. The magnetic instability comes first for equal sizes of the two pockets, but loses to superconductivity upon doping. The superconducting gap has no nodes, but changes sign between the two Fermi surfaces extended s-wave symmetry. We argue that the T dependencies of the spin susceptibility and NMR relaxation rate for such a state are exponential only at very low T, and can be well fitted by power laws over a wide T range below Tc.read more
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Magnetic penetration depth in the presence of a spin-density wave in multiband superconductors at zero temperature
Dushko Kuzmanovski,Maxim Vavilov +1 more
TL;DR: In this article, the authors present a theoretical description of the London penetration depth of a multiband superconductor in the case when both superconducting and spin-density wave orders coexist.
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Order-Parameter Anisotropies in the Pnictides - An Optimization Principle for Multi-Band Superconductivity
TL;DR: In this article, the superconducting gap in materials with multiple Fermi-surface (FS) pockets was analyzed for two proto-type ferropnictide setups and it was shown that the symmetry of the gap and nodal versus nodeless behavior is driven by this optimization requirement.
Journal Article
Order-Parameter Anisotropies in the Pnictides - An Optimization Principle for Multi-Band Superconductivity
TL;DR: In this paper, the superconducting gap in materials with multiple Fermi-surface (FS) pockets was analyzed and the symmetry of the gap and nodal versus nodeless behavior was driven by functional renormalization group (FRG) calculations.
Journal ArticleDOI
Electronic Raman spectra in iron-based superconductors with two-orbital model
TL;DR: In this article, the electronic Raman spectra in iron-based superconductors with two-orbital model is discussed and some possible pairing symmetries of the gap are selected.
Journal ArticleDOI
Magnetic behavior of dirty multiband superconductors near the upper critical field
TL;DR: In this article, the magnetic properties of dirty multiband superconductors near the upper critical field are studied and the parameter kappa(2) characterizing magnetization slope is shown to have a significant temperatur.
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