Fe57 Mössbauer study of magnetic ordering in superconducting K0.80Fe1.76Se2.00 single crystals

D. H. Ryan; W. N. Rowan-Weetaluktuk; J. M. Cadogan; R. Hu; W. E. Straszheim; S. L. Bud’ko; P. C. Canfield

doi:10.1103/PhysRevB.83.104526

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Fe57 Mössbauer study of magnetic ordering in superconducting K0.80Fe1.76Se2.00 single crystals

D. H. Ryan, W. N. Rowan-Weetaluktuk, J. M. Cadogan, R. Hu, W. E. Straszheim, S. L. Bud’ko, P. C. Canfield

DOI 10.1103/PhysRevB.83.104526 · Physical Review B

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Abstract

The magnetic ordering of superconducting single crystals of K0.80Fe1.76Se2.00 has been studied between 10 and 550 K using Fe57 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
K0.80Fe1.76Se2.00 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.1	Pressure not reported	onset
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
FeSe0.5Te0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	unknown