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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Spin reorientation driven by the interplay between spin-orbit coupling and Hund's rule coupling in iron pnictides
Morten Christensen,Morten Christensen,Jian Kang,Brian M. Andersen,Ilya Eremin,Ilya Eremin,Rafael M. Fernandes +6 more
TL;DR: In this paper, the authors investigate the origin of spin anisotropy in hole-doped iron pnictides using an itinerant microscopic electronic model that respects all the symmetry properties of a single FeAs plane.
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Is Fermi-Surface Nesting the Origin of Superconductivity in Iron Pnictides?: A Fluctuation–Exchange-Approximation Study
Ryotaro Arita,Hiroaki Ikeda +1 more
TL;DR: In this paper, the authors investigated whether Fermi-surface nesting can give rise to high-temperature superconductivity in iron pnictides and showed that FS does not necessarily favor the stripe antiferromagnetic order observed in experiments.
Journal ArticleDOI
Spin Fluctuations and Unconventional Superconductivity in the Fe-Based Oxypnictide Superconductor LaFeAsO0.7 Probed by 57Fe-NMR
Nobuyuki Terasaki,Hidekazu Mukuda,Mitsuharu Yashima,Yoshio Kitaoka,Kiichi Miyazawa,Parasharam M. Shirage,Hijiri Kito,Hiroshi Eisaki,Akira Iyo +8 more
TL;DR: In this article, 57 Fe-NMR studies on the oxygen-deficient iron (Fe)-based oxypnictide superconductor LaFeAsO 0.7 (T c = 28 K) enriched by 57 Fe isotope.
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A perspective on pnictide superconductors
TL;DR: In this article, the superconductivity of FeSe is described as coming from a combination of Resonant Valence Bond (RVB) and Excitonic Insulator physics, and incorporating Boson-Fermion degeneracy.
Journal ArticleDOI
Impurity-induced in-gap state and Tc in sign-reversing s-wave superconductors: analysis of iron oxypnictide superconductors
Yuko Senga,Hiroshi Kontani +1 more
TL;DR: In this paper, the isotropic two-band BCS model is applied to oxypnictide superconductors and the effect of impurities on the sign-reversing fully gapped superconducting state is investigated.
References
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