57-Fe Mossbauer study of magnetic ordering in superconducting K0.85Fe1.83Se2.09 single crystals
Abstract
The magnetic ordering of superconducting single crystals of K0.85Fe1.83Se2.09 has been studied between 10K and 550K using 57-Fe Mossbauer spectroscopy. Despite being superconducting below Tsc ~30K, the iron sublattice in K0.85Fe1.83Se2.09 clearly exhibits magnetic order from well below Tsc to its N\'eel temperature of TN = 532 +/- 2K. The iron moments are ordered perpendicular to the single crystal plates, i.e. parallel to the crystal c-axis. The order collapses rapidly above 500K and the accompanying growth of a paramagnetic component suggests that the magnetic transition may be first order, which may explain the unusual temperature dependence reported in recent neutron diffraction studies.
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