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

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

2010-06-24

arxiv.org/abs/1006.4812v1

J. Phys. Soc. Jpn. 80 (2011) 023704

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1143/JPSJ.80.023704

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.

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