Physics and Astronomy, Ames Laboratory
Journal or Book Title
Physical Review B
The magnetic ordering of superconducting single crystals of K0.80Fe1.76Se2.00 has been studied between 10 and 550 K using 57Fe Mössbauer spectroscopy. Despite being superconducting below Tsc~30 K, the iron sublattice in K0.80Fe1.76Se2.00 clearly exhibits magnetic order from well below Tsc to its Néel temperature of TN=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.
American Physical Society
Ryan, D. H.; Rowan-Weetaluktuk, W. N.; Cadogan, J. M.; Hu, R.; Straszheim, Warren E.; Bud’ko, Sergey L.; and Canfield, Paul C., "57-Fe Mössbauer study of magnetic ordering in superconducting K0.80Fe1.76Se2.00 single crystals" (2011). Physics and Astronomy Publications. 658.