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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Magnetism, Superconductivity, and Spontaneous Orbital Order in Iron-Based Superconductors: Which Comes First and Why?
TL;DR: In this article, the interplay between magnetism and orbital order and how these properties affect superconductivity was investigated, and a theoretical investigation was carried out to find out the relationship between the two properties.
Journal ArticleDOI
Unconventional Superconductivity
TL;DR: In this article, the authors compared the fundamental properties of 9 unconventional superconducting classes of materials - from 4f-electron heavy fermions to organic superconductors to classes where only three known members exist.
Journal ArticleDOI
Space group symmetry, spin-orbit coupling, and the low-energy effective Hamiltonian for iron-based superconductors
Vladimir Cvetkovic,Oskar Vafek +1 more
TL;DR: In this article, the symmetry adapted low-energy effective Hamiltonian for the electronic states in the vicinity of the Fermi level in iron-based superconductors was constructed using Luttinger's method of invariants.
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Exotic d-Wave Superconducting State of Strongly Hole-Doped K x Ba 1-x Fe 2 As 2
TL;DR: The superconducting phase in the K(x)Ba(1-x)Fe2As2 122 compounds from moderate to strong hole-doping regimes is investigated using the functional renormalization group and it is shown that, while the system develops a nodeless anisotropic s(±) order parameter in the moderately doped regime, gapping out the electron pockets at strong hole doping drives the system into a nodal d-wavesuperconducting state.
Journal ArticleDOI
Magnetically driven suppression of nematic order in an iron-based superconductor
Sevda Avci,Omar Chmaissem,Omar Chmaissem,Jared M. Allred,Stephan Rosenkranz,Ilya Eremin,Andrey V. Chubukov,Daniel E. Bugaris,Duck Young Chung,Mercouri G. Kanatzidis,Mercouri G. Kanatzidis,John-Paul Castellan,John A. Schlueter,Helmut Claus,Dmitry D. Khalyavin,Pascal Manuel,Aziz Daoud-Aladine,Raymond Osborn +17 more
TL;DR: The observation by neutron powder diffraction of an additional fourfold-symmetric phase in Ba1-xNaxFe2As2 close to the suppression of SDW order is reported, which is consistent with the predictions of magnetically driven models of nematic order.
References
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