Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors

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.

arXiv comment10 pages, 9 figures, added discussions and references, published in Phys. Rev. B

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Cited by in corpus (15)

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• Quantum Criticality in Electron-doped BaFe_{2-x}Ni_xAs_2
• Possible three dimensional nodes in the $s\pm$ superconducting gap of BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Orbital Order, Structural Transition and Superconductivity in Iron Pnictides
• Spin nematic fluctuations near a spin-density-wave phase
• A High-Tc Mechanism of Iron Pnictide Superconductivity due to Cooperation of Ferro-orbital and Antiferromagnetic Fluctuations
• Orbital-Selective Superconductivity and the Effect of Lattice Distortion in Iron-Based Superconductors
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• Local correlation effects on the s+-- and s++-wave superconductivities mediated by magnetic and orbital fluctuations in the 5-orbital Hubbard model for iron pnictides
• Repulsive interaction helps superconductivity in fullerides
• Universal quasi-degenerate orbital origin of two-dome phases in iron pnictide superconductors
• Metal-insulator transition and superconductivity in the two-orbital Hubbard-Holstein model for iron-based superconductors
• Hole-$s_{\pm }$ State Induced by Coexisting Ferro- and Aniferromagnetic and Aniferro-orbital Fluctuations in the Iron Pnictides
• Orbital-lattice coupling and orbital ordering instability in iron pnictides