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Iron-based layered compound LaFeAsO is an antiferromagnetic semimetal
LaFeAsO is a parent compound of iron-based F-doped superconductors. An understanding of its ground phase and electronic structure is a precondition to understanding the underlying superconductivity mechanism. Our study shows that LaFeAsO is a quasi-two-dimensional antiferromagnetic semimetal with most carriers being electrons and with a magnetic moment of $2.3{\ensuremath{\mu}}_{B}$ located …