Neutron and ARPES Constraints on the Couplings of the Multiorbital Hubbard Model for the Pnictides

Abstract

The results of neutron scattering and angle-resolved photoemission experiments for the Fe-pnictide parent compounds, and their metallic nature, are shown to impose severe constraints on the range of values that can be considered "realistic" for the intraorbital Hubbard repulsion U and Hund coupling J in multiorbital Hubbard models treated in the mean-field approximation. Phase diagrams for three- and five-orbital models are here provided, and the physically realistic regime of couplings is highlighted, to guide future theoretical work into the proper region of parameters of Hubbard models. In addition, using the random phase approximation, the pairing tendencies in these realistic coupling regions are investigated. It is shown that the dominant spin-singlet pairing channels in these coupling regimes correspond to nodal superconductivity, with strong competition between several states that belong to different irreducible representations. This is compatible with experimental bulk measurements that have reported the existence of nodes in several Fe-pnictide compounds.

16 pages, 20 figures

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• Magnetic states of the five-orbital Hubbard model for one-dimensional iron-based superconductors
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• Electronic structure, spin excitations, and orbital ordering in a three-orbital model for iron pnictides
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• J = 0 nonmagnetic insulating state in K${}_2$Os$X_6$ (X = F, Cl and Br)
• Electric Field Induced Superconductivity in Bilayer Octagraphene
• Magnon damping and mode softening in quantum double-exchange ferromagnets
• Evidence for valence-bond pairing in a one-dimensional two-orbital system
• Intertwined charge, spin, and orbital degrees of freedom under electronic correlations in the one-dimensional Fe${}^{3+}$ chalcogenide chain