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The magnetic ordering of superconducting single crystals ofK_0.85Fe_1.83Se_2.09 has been studied between 10K and 550K using 57-FeMossbauer spectroscopy. Despite being superconducting below T_sc ~30K, the ironsublattice in K_0.85Fe_1.83Se_2.09 clearly exhibits magnetic order from wellbelow T_sc to its N\'eel temperature of T_N = 532 +/- 2K. The iron moments areordered perpendicular to the single crystal plates, i.e. parallel to thecrystal c-axis. The order collapses rapidly above 500K and the accompanyinggrowth of a paramagnetic component suggests that the magnetic transition may befirst order, which may explain the unusual temperature dependence reported inrecent neutron diffraction studies.

57-Fe Mossbauer study of magnetic ordering in superconducting K_0.85Fe_1.83Se_2.09 single crystals