Two types of s-wave pairing due to magnetic and orbital fluctuations in the two-dimensional 16-band d−p model for iron-based superconductors
Yuki Yanagi, Youichi Yamakawa, Yoshiaki Ōno
DOI 10.1103/PhysRevB.81.054518 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We study superconductivity in the two-dimensional 16-band d−p model extracted from a tight-binding fit to the band structure of LaFeAsO, using the random phase approximation. When the intraorbital repulsion U is larger than the interorbital one U′, an extended s-wave (s±-wave) pairing with sign reversal of order parameter is mediated by antiferromagnetic spin fluctuations, while when U<U′ another kind of s-wave (s++-wave) pairing without sign reversal is mediated by ferro-orbital fluctuations. The s++-wave pairing is enhanced due to the electron-phonon coupling and then can be expanded over the realistic parameter region with U>U′.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | onset |
Similar papers
Small anisotropy in iron-based superconductors induced by electron correlation
similarity 0.95Hyo Seok Ji et al.
Source status unknown — claims are unverified
Symmetry of superconducting states with two orbitals on a tetragonal lattice: Application to LaFeAsO1−xFx
similarity 0.95Yi Zhou et al.
Source status unknown — claims are unverified
Switching of intra-orbital spin excitations in electron-doped iron pnictide superconductors
similarity 0.95Soshi Iimura et al.
Source status unknown — claims are unverified
Electronic structure and Fermi surface of the superconductors LaNiBiO and LaCuBiO from first principles
similarity 0.95I. R. Shein et al.
Source status unknown — claims are unverified
Enhanced superconductivity and moderate spin fluctuations suppressed at low energies in heavily electron-doped La1111-based superconductor
similarity 0.95T. Kouchi et al.
Source status unknown — claims are unverified
Improper s-wave symmetry of the electronic pairing in iron-based superconductors by first-principles calculations
similarity 0.95M. Casula & S. Sorella
Source status unknown — claims are unverified