Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Qureshi, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Steffens, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lamago, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sidis, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sobolev, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ewings, R. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Harnagea, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wurmehl, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Buechner, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Braden, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language SUPERCONDUCTIVITY Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42583