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Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2

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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Lumsden, M.
849f33df-513b-45f6-9c19-0a6d67826b26
Christianson, A.
687ff7d2-c781-41e2-b305-a6690f14f3f5
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.
12b613a4-baca-43c0-835f-9dc31a5e6a90
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.
6638dcc7-8672-4908-800e-a744a64bb568

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), 107005-[4pp}. (doi:10.1103/PhysRevLett.102.107005).

Record type: Article

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: 11 Apr 2022 17:58

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Contributors

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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