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

The magnetic ordering of superconducting single crystals of K_0.85Fe_1.83Se_2.09 has been studied between 10K and 550K using 57-Fe Mossbauer spectroscopy. Despite being superconducting below T_sc ~30K, the iron sublattice in K_0.85Fe_1.83Se_2.09 clearly exhibits magnetic order from well below T_sc to its Néel temperature of T_N = 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.

preprint2011arXivOpen access
D. H. RyanW. N. Rowan-WeetaluktukJ. M. CadoganR. HuW. E. StraszheimS. L. Bud'koP. C. Canfield
cond-mat.supr-con
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D. H. RyanW. N. Rowan-WeetaluktukJ. M. CadoganR. HuW. E. StraszheimS. L. Bud'koP. C. Canfield

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