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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THz electrodynamics of BaFe$_{1.91}$Ni$_{0.09}$As$_{2}$ film analyzed in the framework of multiband Eliashberg theory
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TL;DR: In this paper, the temperature dependences of the plasma frequency, superfluid density and London penetration depth were determined from terahertz spectra of conductivity and dielectric permittivity of BaFe$1.91}$Ni$0.09}$As$2}$ film with critical temperature $T_c=19.6$~K.
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Ferrimagnetic Spin-Wave Resonance and Superconductivity in Carbon Nanotubes Incorporated in Diamond Matrix
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In-plane magnetic field vs. temperature phase diagram of a quasi-2D frustrated multiband superconductor
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