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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Properties of dirty two-band superconductors with repulsive interband interaction : Normal modes, length scales, vortices, and magnetic response
TL;DR: In this paper, the authors studied the normal modes and their associated coherence lengths in two-band superconductors with repulsive interband interaction and found that the soft modes of these materials exhibit a rich spectrum of physical properties that are absent in their clean counterparts.
Journal ArticleDOI
Topological superconductivity, ferromagnetism, and valley-polarized phases in moiré systems: Renormalization group analysis for twisted double bilayer graphene
TL;DR: In this paper, perturbative renormalization group analyses for electrons near Van Hove singularities were performed to investigate competition among all possible instabilities, including second order and logarithmically divergent contributions.
Journal ArticleDOI
Electronic phase diagram of disordered Co doped BaFe2As2−δ
F. Kurth,Kazumasa Iida,S Trommler,Jens Hänisch,Konstantin Nenkov,J. Engelmann,Steffen Oswald,J. Werner,Ludwig Schultz,Bernhard Holzapfel,Silvia Haindl +10 more
TL;DR: In this article, it was shown that in the dirty limit the superconducting dome in the electronic phase diagram of Ba(Fe1−xCox)2As2−δ shifts towards lower doping concentrations, which differs significantly from observations in single crystals.
Journal ArticleDOI
Influence of $s_{\pm}$ symmetry on unconventional superconductivity in pnictides above the Pauli limit -- two-band model study
TL;DR: In this paper, the two-band Fe-based superconductors (FeSC) model with s-wave and wave symmetry was analyzed in real space and the results showed that the phase transition from the BCS to the FFLO phase is always first order.
Journal ArticleDOI
Theory of multiband superconductivity in iron pnictides.
Mukul S. Laad,L. Craco +1 more
TL;DR: Very good quantitative agreement with various key observations in the SC state and reconciliation with NMR and penetration depth data in the same picture are particularly attractive features of this proposal, but clinching evidence would be an experimental confirmation of c-axis nodes in future work.
References
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