Unified Picture for Magnetic Correlations in Iron-Based Superconductors

Abstract

The varying metallic antiferromagnetic correlations observed in iron-based superconductors are unified in a model consisting of both itinerant electrons and localized spins. The decisive factor is found to be the sensitive competition between the superexchange antiferromagnetism and the orbital-degenerate double-exchange ferromagnetism. Our results reveal the crucial role of Hund's rule coupling for the strongly correlated nature of the system and suggest that the iron-based superconductors are closer kin to manganites than cuprates in terms of their diverse magnetism and incoherent normal-state electron transport. This unified picture would be instrumental for exploring other exotic properties and the mechanism of superconductivity in this new class of superconductors.

Revised for publication. 3 figures

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Cited by in corpus (3)

• Conductivity anisotropy in the antiferromagnetic state of iron pnictides
• Synthesis, crystal structure and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals
• Disappearance of static magnetic order and evolution of spin fluctuations in Fe${}_{1+\delta }$Se${}_x$Te${}_{1-x}$