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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Superconducting gap structure of the 115s revisited.
Filip Ronning,Jian-Xin Zhu,Tanmoy Das,Matthias J. Graf,R. C. Albers,H. B. Rhee,H. B. Rhee,Warren E. Pickett +7 more
TL;DR: In this paper, density functional theory calculations of the electronic structure of Ce- and Pu-based heavy fermion superconductors in the so-called 115 family are performed, and the gap equation is used to consider which superconducting order parameters are most favorable assuming a pairing interaction that is peaked at (π, π, qz), the wavevector for the antiferromagnetic ordering found in close proximity.
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Ground-state pairing correlations in the S4 symmetric microscopic model for iron-based superconductors
Yang Wu,Guangkun Liu,Tianxing Ma +2 more
TL;DR: In this article, the ground-state pairing correlations in the S4 symmetric microscopic model for iron-based superconductors were computed with the constrained-path Monte Carlo method, and it was shown that the sxy pairing dominates over other pairing correlations and is positive when the pair separation exceeds several lattice constants.
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Thermodynamic signatures of an antiferromagnetic quantum critical point inside a superconducting dome
TL;DR: In this paper, the specific heat of a fully gapped BCS superconducting state was investigated and the authors showed that the specific temperature vanishes quadratically with temperature, as opposed to the typical exponential suppression seen in full gapped superconductors.
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Phase diagram of dirty two-band superconductors and observability of impurity-induced s + i s state
TL;DR: In this paper, the phase diagram of dirty two-band superconductors was investigated and the properties and observability of the time-reversal symmetry-breaking s + is superconducting st
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Non-London electrodynamics in a multiband London model : Anisotropy-induced nonlocalities and multiple magnetic field penetration lengths
TL;DR: The London model describes strongly type-2 superconductors as massive vector field theories, where the magnetic field decays exponentially at the length scale of the London penetration length.
References
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