Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d−p model for iron-based superconductors
Yuki Yanagi, Youichi Yamakawa, Naoko Adachi, Yoshiaki Ōno
DOI 10.1103/PhysRevB.82.064518 · Physical Review B
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Abstract
We study the electronic states and the superconductivity in the two-dimensional 16-band d−p model coupled with A1g, B1g, and Eg local phonons and obtain the rich phase diagram including the magnetic-, charge-, and orbital-ordered phases on the parameter plane of the Coulomb and electron-phonon interactions. When the electron-phonon interaction is dominant, the charge fluctuations induce the s++-wave superconductivity, while when the Coulomb interaction is dominant, the magnetic fluctuations induce the s±-wave superconductivity. Remarkably, the orbital fluctuations are enhanced due to the cooperative effects of the Coulomb and electron-phonon interactions and induce the s++-wave and the nodal s±-wave superconductivities.
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. | 26 | Pressure not reported | unknown |
| BaFe2(As1-xPx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure not reported | unknown |
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