Magnetic interactions in iron superconductors: A review

Abstract

High temperature superconductivity in iron pnictides and chalcogenides emerges when a magnetic phase is suppressed. The multi-orbital character and the strength of correlations underlie this complex phenomenology, involving magnetic softness and anisotropies, with Hund's coupling playing an important role. We review here the different theoretical approaches used to describe the magnetic interactions in these systems. We show that taking into account the orbital degree of freedom allows us to unify in a single phase diagram the main mechanisms proposed to explain the (π,0) order in iron pnictides: the nesting-driven, the exchange between localized spins, and the Hund induced magnetic state with orbital differentiation. Comparison of theoretical estimates and experimental results helps locate the Fe superconductors in the phase diagram. In addition, orbital physics is crucial to address the magnetic softness, the doping dependent properties, and the anisotropies.

Invited review article for a focus issue of Comptes Rendus Physique: 26 pages, 10 figures. Revised version, as accepted. Small changes throughout the text plus new subsection (Sec. IIIE)

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• Evidence for Dirac Nodes from Quantum Oscillations in SrFe${}_2$As${}_2$
• Spin dependent electron-phonon interaction in SmFeAsO by low-temperature Raman spectroscopy
• Nematic phase without Heisenberg physics in FeAs planes
• Theoretical investigation of FeTe magnetic ordering under hydrostatic pressure
• Topological Surface States in Paramagnetic and Antiferromagnetic Iron Pnictides
• Coupling of the A_{1g} As-phonon to magnetism in iron pnictides
• Antiferromagnetism in Iron-Based Superconductors: Selection of Magnetic Order and Quasiparticle Interference
• Acoustic and optical phonon dynamics from femtosecond time-resolved optical spectroscopy of superconducting iron pnictide Ca(Fe_0.944Co_0.056)_2As_2
• Effect of uniaxial pressure on the magneto-structural transitions of iron arsenide superconductors
• Memory function approach to in-plane anisotropic resistivity in the antiferromagnetic phase of iron arsenide superconductors
• Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Why MgFeGe is not a superconductor
• Anisotropic inplane spin correlation in the parent and Co-doped BaFe2As2: a neutron scattering study

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