Multiband magnetism and superconductivity in Fe-based compounds

Abstract

Recent discovery of high T_c superconductivity in Fe-based compounds may have opened a new pathway to the room temperature superconductivity. The new materials feature FeAs layers instead of the signature CuO_2 planes of much-studied cuprates. A model Hamiltonian describing FeAs layers is introduced, highlighting the crucial role of puckering of As atoms in promoting d-electron itinerancy and warding off large local-moment magnetism of Fe ions, the main enemy of superconductivity. Quantum many-particle effects in charge, spin and multiband channels are explored and a nesting-induced spin density-wave order is found in the parent compund. We argue that this largely itinerant antiferromagnetism and high T_c itself are essentially tied to the multiband nature of the Fermi surface.

7 pages, 4 figures; typos corrected, updated Fig. 4, Fig. 1c added

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• Odd-Parity Magnetism in Fe-Based Superconductors
• Enhanced low-energy magnetic excitations evidencing the Cu-induced localization in an Fe-based superconductor Fe${}_{0.98}$Te${}_{0.5}$Se${}_{0.5}$
• Theory of Andreev reflection in a two-orbital model of iron-pnictide superconductors
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• Superconducting and critical properties of PrOFe0.9Co0.1As: effect of P doping
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