Insulating magnetism in vacancy-ordered K0.8Fe1.6Se2

Article

关键词: EXCHANGE INTERACTIONS;    IRON PNICTIDES;    SPIN-WAVES;    SUPERCONDUCTIVITY;   

DOI  :  10.1103/PhysRevB.86.081106

来源: SCIE

【 摘 要 】

We unveil the physical origin of the insulating block checkerboard antiferromagnetism in vacancy-ordered K0.8Fe1.6Se2. Our first-principles electronic structure analysis reveals its incompatibility with a simple Fermi-surface nesting or Mott insulator scenario, and suggests the picture of coexisting itinerant and localized electronic states. Consistently, we demonstrate that it can be unified with the metallic collinear or bicollinear antiferromagnetism of the vacancy-free parent compounds LaOFeAs, BaFe2As2, or FeTe in the spin-fermion model. These results indicate that the blocking effects of Hund's rule coupling and the resulting electron correlation are crucial to the electronic and magnetic structures of iron-based superconductors.

【 授权许可】

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