Unified Picture for Magnetic Correlations in Iron-Based Superconductors

Details Unified Picture for Magnetic Correlations in Iron-Based Superconductors Unified Picture for Magnetic Correlations in Iron-Based Superconductors

2010-03-02

arxiv.org/abs/1003.0512v2

Phys. Rev. Lett. 105, 107004 (2010)

Physics

Condensed Matter

Superconductivity

Revised for publication. 3 figures

Scientific paper

10.1103/PhysRevLett.105.107004

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.

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