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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Renormalization group analysis of competing orders and the pairing symmetry in Fe-based superconductors
TL;DR: In this article, the authors analyze antiferromagnetism and superconductivity in novel Fe-based superconductors within the weak-coupling, itinerant model of electron and hole pockets near (0, 0) and ( π, π ) in the folded Brillouin zone.
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Nodes in the gap function of LaFePO, the gap function of the Fe(Se,Te) systems, and the STM signature of the s ± pairing
TL;DR: In this article, a functional renormalization group (FRG) was used to determine the pairing form factor in Fe(Se,Te) and LaFePO superconductors.
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Anisotropic spin fluctuations and multiple superconducting gaps in hole-doped Ba0.72K0.28Fe2As2: NMR in a single crystal
Kazuaki Matano,Z. Li,G. L. Sun,D. L. Sun,Chengtian Lin,Masanori Ichioka,Guo-Qing Zheng,Guo-Qing Zheng +7 more
TL;DR: In this paper, the 75As-NMR study on a single crystal of the hole-doped iron-pnictide superconductor Ba0.72K 0.28Fe2As2 (Tc=31.5
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The Fulde–Ferrell–Larkin–Ovchinnikov State in Pnictides
Andrzej Ptok,Dawid Crivelli +1 more
TL;DR: In this article, the existence of a FFLO phase in two-band FeSC was shown by the analysis of the Cooper-pair susceptibility in the system with cos(kx) · cos(ky) symmetry, regardless of the exhibited order parameter symmetry.
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Impurity Effects in Sign-Reversing Fully Gapped Superconductors: Analysis of FeAs Superconductors
Yuko Senga,Hiroshi Kontani +1 more
TL;DR: In this paper, a simple two-band BCS model with a repulsive interband interaction was analyzed, and the robustness of superconductivity against impurities in FeAs superconductors was naturally understood in terms of the sign-reversing fully gapped state.
References
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