The Novel Magnetism in K$_{0.8}$Fe$_{1.6}$Se$_2$ Explained in the Unified Picture

Details The Novel Magnetism in K$_{0.8}$Fe$_{1.6}$Se$_2$ Explained in the Unified Picture The Novel Magnetism in K$_{0.8}$Fe$_{1.6}$Se$_2$ Explained in the Unified Picture

2011-06-05

arxiv.org/abs/1106.0881v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

The block checkerboard antiferromagnetism in insulating K$_{0.8}$Fe$_{1.6}$Se$_2$ is investigated theoretically. Neither the Fermi surface nesting nor Mott insulator scenario is supported by our first-principles analysis of the unfolded Fermi surface, band gap, and orbital polarization. Instead, the orbital-degenerate double-exchange model, previously proposed to unify known magnetic structures of iron-based superconductors, is found sufficient to explain this novel spin order as well as associated quantum magnetic transition induced by tetramer lattice distortion. Our findings reinforce the notion that the iron-based superconductors be universally described in the framework of coexisting itinerant and localized electronic states.

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