Magnetism and its microscopic origin in iron-based high-temperature superconductors

Abstract

High-temperature superconductivity in the iron-based materials emerges from, or sometimes coexists with, their metallic or insulating parent compound states. This is surprising since these undoped states display dramatically different antiferromagnetic (AF) spin arrangements and N$\acute{\mathrm{e}}$el temperatures. Although there is general consensus that magnetic interactions are important for superconductivity, much is still unknown concerning the microscopic origin of the magnetic states. In this review, progress in this area is summarized, focusing on recent experimental and theoretical results and discussing their microscopic implications. It is concluded that the parent compounds are in a state that is more complex than implied by a simple Fermi surface nesting scenario, and a dual description including both itinerant and localized degrees of freedom is needed to properly describe these fascinating materials.

14 pages, 4 figures, Review article, accepted for publication in Nature Physics

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Cited by in corpus (7)

• RPA Analysis of a Two-orbital Model for the BiS2-based Superconductors
• Magnetic States of the Two-Leg Ladder Alkali Metal Iron Selenides $A$Fe${}_2$Se${}_3$
• Phase separation of antiferromagnetic ground states in systems with imperfect nesting
• Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor
• Magnetic anisotropy in hole-doped superconducting Ba 0.67K 0.33Fe 2As2 probed by polarized inelastic neutron scattering
• Temperature dependence of the paramagnetic spin excitations in BaFe${}_2$As${}_2$
• Paramagnetic spin excitations in insulating Rb${}_{0.8}$Fe${}_{1.6}$Se${}_2$