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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Optical conductivity in ferropnictides with and without gap nodes
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Theory of nonequilibrium dynamics of multiband superconductors
TL;DR: In this article, the nonequilibrium dynamics of multiband BCS superconductors subjected to ultrashort pump pulses were studied using density-matrix theory, and the time evolution of the Bogoliubov quasiparticle densities and the superconducting order parameters were computed as a function of pump pulse frequency, duration, and intensity.
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Understanding Novel Superconductors with Ab Initio Calculations
TL;DR: In this paper, the authors give an overview of the existing computational methods for superconductivity, and present selected examples of material discoveries that exemplify the main advancements in the field.
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Iron-based superconductors
TL;DR: The phenomenon of superconductivity has a rich and interesting history, starting in 1911 when Kamerl et al. as mentioned in this paper proposed the first superconducting device. But it is difficult to find a suitable one.
References
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