Unified Picture for Magnetic Correlations in Iron-Based Superconductors

Wei-Guo Yin, Chi-Cheng Lee, and Wei Ku
Phys. Rev. Lett. 105, 107004 – Published 2 September 2010

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.

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  • Received 12 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.107004

© 2010 The American Physical Society

Authors & Affiliations

Wei-Guo Yin*, Chi-Cheng Lee, and Wei Ku

  • Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA

  • *Corresponding author. wyin@bnl.gov

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Issue

Vol. 105, Iss. 10 — 3 September 2010

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