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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Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters
TL;DR: In this paper, a single impurity problem is investigated for multiband s-wave superconductors with different sign order parameters, and the energy of the local bound states as a function of strength of two types of impurity scattering is presented.
Ultra-low Temperature Measurements of London Penetration Depth in Iron Selenide Telluride Superconductors
TL;DR: In this paper, the authors present a Dissertation that is protected by copyright and/or related rights, which is brought to you by ScholarWorks@UNO with permission from the rights-holder(s).
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Modeling Unconventional Superconductivity at the Crossover between Strong and Weak Electronic Interactions.
TL;DR: In this article, the authors employed quantum Monte Carlo methods to solve a multiband Hubbard model that does not suffer from the sign problem and in which only repulsive interband interactions are present.
Journal ArticleDOI
Orbital loop currents in iron-based superconductors
TL;DR: In this paper, it was shown that the antiferromagnetic state commonly observed in the phase diagrams of the iron-based superconductors necessarily triggers loop currents characterized by charge transfer between different Fe $3d$ orbitals.
Journal ArticleDOI
Superconducting gap structure of the 115's revisited
Filip Ronning,Jian-Xin Zhu,Tanmoy Das,Matthias J. Graf,R. C. Albers,Hahnbidt Rhee,Warren E. Pickett +6 more
TL;DR: There is evidence that an extended s-wave order parameter with nodes is also plausible and this work discusses whether these results are consistent with current observations and possible measurements that could help distinguish between these scenarios.
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