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The discovery of cuprate high Tc superconductors has inspired searching forunconventional su- perconductors in magnetic materials. A successful recipe hasbeen to suppress long-range order in a magnetic parent compound by doping orhigh pressure to drive the material towards a quantum critical point, which isreplicated in recent discovery of iron-based high TC superconductors. Thelong-range magnetic order coexisting with superconductivity has either a smallmagnetic moment or low ordering temperature in all previously establishedexamples. Here we report an exception to this rule in the recently discoveredpotassium iron selenide. The superconducting composition is identified as theiron vacancy ordered K0.8Fe1.6Se2 with Tc above 30 K. A novel large moment 3.31{\mu}B/Fe antiferromagnetic order which conforms to the tetragonal crystalsymmetry has the unprecedentedly high an ordering temperature TN = 559 K for abulk superconductor. Staggeredly polarized electronic density of states thus issuspected, which would stimulate further investigation into superconductivityin a strong spin-exchange field under new circumstance.

A Novel Large Moment Antiferromagnetic Order in K0.8Fe1.6Se2 Superconductor