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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Suppression of the Critical Temperature of Superconducting NdFeAs(OF) Single Crystals by Kondo-Like Defect Sites Induced by α -Particle Irradiation
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TL;DR: In this paper, the authors report the 75 As-NQR and NMR studies on the iron arsenide superconductor LiFeAs with T c ∼17 K. The spin lattice relaxation rate, 1/T 1 T, decreases below T c without a coherence peak, and can be fitted by gaps with s ± wave symmetry in the presence of impurity scattering.
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Paramagnetic spin correlations in CaFe2As2 single crystals
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Superconducting properties of the s ±-wave state: Fe-based superconductors.
Yunkyu Bang,G. R. Stewart +1 more
TL;DR: In this paper, the authors provide detailed explanations of the theoretical principles for the various non-trivial superconducting (SC) properties of the [Formula: see text]-wave pairing state, and then critically compare the theoretical predictions with experiments on FeSCs.
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Quantum Simulation with Hybrid Tensor Networks.
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References
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