Magnetic Properties of Ab initio Model for Iron-Based Superconductors LaFeAsO

Takahiro Misawa; Kazuma Nakamura; Masatoshi Imada

doi:10.1143/JPSJ.80.023704

Magnetic Properties of Ab initio Model for Iron-Based Superconductors LaFeAsO

Strongly Correlated Electrons 2011-01-26 v1 Superconductivity

Authors: Takahiro Misawa , Kazuma Nakamura , Masatoshi Imada

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Abstract

By using variational Monte Carlo method, we examine an effective low-energy model for LaFeAsO derived from an ab initio downfolding scheme. We show that quantum and many-body fluctuations near a quantum critical point largely reduce the antiferromagnetic (AF) ordered moment and the model not only quantitatively reproduces the small ordered moment in LaFeAsO, but also explains the diverse dependence on LaFePO, BaFe2As2 and FeTe. We also find that LaFeAsO is under large orbital fluctuations, sandwiched by the AF Mott insulator and weakly correlated metals. The orbital fluctuations and Dirac-cone dispersion hold keys for the diverse magnetic properties.

Keywords

iron-based superconductor LaFeAsO variational Monte Carlo antiferromagnetic order orbital fluctuation Dirac cone quantum critical point

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@article{arxiv.1006.4812,
  title  = {Magnetic Properties of Ab initio Model for Iron-Based Superconductors LaFeAsO},
  author = {Takahiro Misawa and Kazuma Nakamura and Masatoshi Imada},
  journal= {arXiv preprint arXiv:1006.4812},
  year   = {2011}
}

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4 pages, 4 figures

Magnetic Properties of Ab initio Model for Iron-Based Superconductors LaFeAsO

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