Journal
PHYSICAL REVIEW B
Volume 83, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.104526
Keywords
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Fonds Quebecois de la Recherche sur la Nature et les Technologies
- Canada Research Chairs program
- AFOSR [FA9550-09-1-0603]
- US Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering
- Iowa State University [DE-AC02-07CH11358]
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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.
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