Qureshi, N., Steffens, P., Lamago, D., Sidis, Y., Sobolev, O., Ewings, R. A., Harnagea, L., Wurmehl, S., Buechner, B. and Braden, M. (2014). Fine structure of the incommensurate antiferromagnetic fluctuations in single-crystalline LiFeAs studied by inelastic neutron scattering. Phys. Rev. B, 90 (14). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

We present an inelastic neutron scattering study on single-crystalline LiFeAs devoted to the characterization of the incommensurate antiferromagnetic fluctuations at Q = (0.5 +/- delta, 0.5 -/+ delta, ql). Time-of-flight measurements show the presence of these magnetic fluctuations up to an energy transfer of 60 meV, while polarized neutrons in combination with a longitudinal polarization analysis on a triple-axis spectrometer prove the pure magnetic origin of this signal. The normalization of the magnetic scattering to an absolute scale yields that magnetic fluctuations in LiFeAs are by a factor of 8 weaker than the resonance signal in nearly optimally Co-doped BaFe2As2, although a factor of 2 is recovered due to the split peaks owing to the incommensurability. The longitudinal polarization analysis indicates weak spin-space anisotropy with a slightly stronger out-of-plane component between 6 and 12 meV. Furthermore, our data suggest a fine structure of the magnetic signal most likely arising from superposing nesting vectors.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Qureshi, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Steffens, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lamago, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sidis, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sobolev, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ewings, R. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Harnagea, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wurmehl, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buechner, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braden, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-425833
DOI: 10.1103/PhysRevB.90.144503
Journal or Publication Title: Phys. Rev. B
Volume: 90
Number: 14
Date: 2014
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1550-235X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SUPERCONDUCTIVITYMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/42583

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