Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
nelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wave vectors (1/2???1/2?? ?L) in tetragonal notation. On cooling below TC, a clear resonance peak is observed at this wave vector with an energy of 8.6(0.5) meV, corresponding to 4.5(0.3) kBTC. This is in good agreement with the canonical value of 5 kBTC observed in the cuprates. The spectrum shows strong dispersion in the tetragonal plane but very weak dispersion along the c axis, indicating that the magnetic fluctuations are two dimensional in nature. This is in sharp contrast to the anisotropic three dimensional spin excitations seen in the undoped parent compounds
107005-[4pp}
Lumsden, M.
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Christianson, A.
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Parshall, D.
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Stone, M.
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Nagler, S.
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MacDougall, G.
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Mook, H.
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Lokshin, K.
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Egami, T.
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Abernathy, D.
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Goremychkin, E.A.
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Osborn, R.
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McGuire, M.
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Sefat, A.
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Jin, R.
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Sales, B.
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Mandrus, D.
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March 2009
Lumsden, M.
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Christianson, A.
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Parshall, D.
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Stone, M.
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Nagler, S.
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MacDougall, G.
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Mook, H.
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Lokshin, K.
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Egami, T.
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Abernathy, D.
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Goremychkin, E.A.
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Osborn, R.
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McGuire, M.
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Sefat, A.
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Jin, R.
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Sales, B.
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Mandrus, D.
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Lumsden, M., Christianson, A., Parshall, D., Stone, M., Nagler, S., MacDougall, G., Mook, H., Lokshin, K., Egami, T., Abernathy, D., Goremychkin, E.A., Osborn, R., McGuire, M., Sefat, A., Jin, R., Sales, B. and Mandrus, D.
(2009)
Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2.
Physical Review Letters, 102 (10), .
(doi:10.1103/PhysRevLett.102.107005).
Abstract
nelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wave vectors (1/2???1/2?? ?L) in tetragonal notation. On cooling below TC, a clear resonance peak is observed at this wave vector with an energy of 8.6(0.5) meV, corresponding to 4.5(0.3) kBTC. This is in good agreement with the canonical value of 5 kBTC observed in the cuprates. The spectrum shows strong dispersion in the tetragonal plane but very weak dispersion along the c axis, indicating that the magnetic fluctuations are two dimensional in nature. This is in sharp contrast to the anisotropic three dimensional spin excitations seen in the undoped parent compounds
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Published date: March 2009
Organisations:
Quantum, Light & Matter Group
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Local EPrints ID: 154937
URI: http://eprints.soton.ac.uk/id/eprint/154937
PURE UUID: f0bb8b6f-3021-4dc8-ada5-2213a3fd9928
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Date deposited: 26 May 2010 13:53
Last modified: 14 Mar 2024 01:35
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Author:
M. Lumsden
Author:
A. Christianson
Author:
D. Parshall
Author:
M. Stone
Author:
S. Nagler
Author:
G. MacDougall
Author:
H. Mook
Author:
K. Lokshin
Author:
T. Egami
Author:
D. Abernathy
Author:
E.A. Goremychkin
Author:
R. Osborn
Author:
M. McGuire
Author:
A. Sefat
Author:
R. Jin
Author:
B. Sales
Author:
D. Mandrus
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