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Fe-57 Mossbauer study of magnetic ordering in superconducting K0.80Fe1.76Se2.00 single crystals

TitleFe-57 Mossbauer study of magnetic ordering in superconducting K0.80Fe1.76Se2.00 single crystals
Publication TypeJournal Article
Year of Publication2011
AuthorsRyan DH, Rowan-Weetaluktuk WN, Cadogan JM, Hu R, Straszheim WE, Bud'ko SL, Canfield PC
Journal TitlePhysical Review B
Volume83
Pages104526
Date Published03/31
ISBN Number1098-0121
Accession NumberISI:000288998200005
Keywordsfe7se8, pressure
Abstract

The magnetic ordering of superconducting single crystals of K0.80Fe1.76Se2.00 has been studied between 10 and 550 Kusing Fe-57 Mossbauer spectroscopy. Despite being superconducting below T-sc similar to 30 K, the iron sublattice in K0.80Fe1.76Se2.00 clearly exhibits magnetic order from well below T-sc to its Neel temperature of T-N = 532 +/- 2 K. The iron moments are ordered almost parallel to the crystal c axis. The order collapses rapidly above 500 K 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.
URL<Go to ISI>://000288998200005
DOI10.1103/PhysRevB.83.104526
Alternate JournalPhys Rev BPhys Rev B