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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TL;DR: In this article, the de Haas-van Alphen effect was used to measure the Fermi surface of the ternary iron-phosphide Pnictides.
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Unconventional temperature enhanced magnetism in Fe1.1Te.
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Excitonic condensation in systems of strongly correlated electrons
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Magnetic impurity resonance states and symmetry of the superconducting order parameter in iron-based superconductors
TL;DR: In this paper, the effect of magnetic impurities on the local quasiparticle density of states in iron-based superconductors was investigated and the impurity-induced bound states can be used to identify the nodal structure of the extended $s$-wave symmetry that is actively discussed in ferropnictides.
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