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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Structural, electronic, and dynamical properties of the tetragonal and collapsed tetragonal phases of KFe 2 As 2
TL;DR: In this paper, the effects of the phase transition on the structural, electronic, and dynamical properties of a compound with a tetragonal lattice structure are investigated, and the dependence of the lattice constants on pressure is reproduced.
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Proposal to determine the Fermi-surface topology of a doped iron-based superconductor using bulk-sensitive Fourier-transform Compton scattering
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TL;DR: In this paper, first-principles calculations of the Compton scattering spectra were carried out to demonstrate that the filling of the hole Fermi surface in LaO1?xFxFeAs produces a distinct signature in the Fourier-transformed Compton spectrum when the momentum transfer vector lies along the [100] direction.
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Implicit renormalization approach to the problem of Cooper instability
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TL;DR: In this article, the authors developed a generic method of implicit renormalization that makes possible the solution of the challenging problem of extracting the transition temperature and of the effective pairing interaction from first-principles data in the normal state.
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Origin of the non-monotonic variance of Tc in the 1111 iron based superconductors with isovalent doping
TL;DR: There is a trade-off between the density of states and the orbital matching, thereby locally maximizing the dxz/yz spin fluctuation and superconductivity in the intermediate regime of As/P ratio.
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A Short Review of the $S_4$ Symmetric Microscopic Model for Iron-Based High Temperature Superconductors
TL;DR: In this article, a two orbital microscopic model for iron-based superconductors based on $S_4$ symmetry (PRX 2 021009(2012)) is presented.
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