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
Citations
More filters
Journal ArticleDOI
Distortional weak-coupling instability of Bogoliubov Fermi surfaces
TL;DR: In this article, it was shown that the coupling of the electrons to the lattice always leads to a weak coupling instability of such a state toward spontaneous breaking of inversion symmetry at low temperatures.
Journal ArticleDOI
The Finite Temperature Effect on Josephson Junction between an s-Wave Superconductor and an s±-Wave Superconductor
TL;DR: In this paper, the critical Josephson current may change its sign when the temperature changes, independent of the type of the junction, the ratios of the gaps and superconducting transition temperatures, as long as the tunneling matrix elements have suitable values.
Journal ArticleDOI
Pressure effects on strained FeSe0.5Te0.5 thin films
TL;DR: In this paper, the authors studied the pressure effect on resistivity and superconducting properties of thin films of the iron chalcogenide superconductor FeSe0.5Te 0.5.
Journal ArticleDOI
Pairing mechanism for nodal s -wave superconductivity in BaFe 2 ( As , P ) 2 : Analysis beyond Migdal-Eliashberg formalism
TL;DR: In this article, the effect of vertex corrections on the Coulomb interaction in Ba122 pnictides superconductors has been investigated and it was shown that vertex corrections can enlarge the orbital-fluctuation-driven attractive interaction.
Journal ArticleDOI
Quantum oscillations probe the normal electronic states of novel superconductors
TL;DR: The current understanding of the Fermi surface studies in iron-based superconductors as determined from quantum oscillations is discussed.
References
Related Papers (5)
Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1-x F x
Density functional study of LaFeAsO(1-x)F(x): a low carrier density superconductor near itinerant magnetism.
David J. Singh,Mao-Hua Du +1 more