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.
Keywords
Cite
@article{arxiv.1003.0512,
title = {Unified Picture for Magnetic Correlations in Iron-Based Superconductors},
author = {Wei-Guo Yin and Chi-Cheng Lee and Wei Ku},
journal= {arXiv preprint arXiv:1003.0512},
year = {2010}
}
Comments
Revised for publication. 3 figures