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

M. D. Lumsden, A. D. Christianson, D. Parshall, M. B. Stone, S. E. Nagler, G. J. MacDougall, H. A. Mook, K. Lokshin, T. Egami, D. L. Abernathy, E. A. Goremychkin, R. Osborn, M. A. McGuire, A. S. Sefat, R. Jin, B. C. Sales, and D. Mandrus
Phys. Rev. Lett. 102, 107005 – Published 12 March 2009

Abstract

Inelastic 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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  • Received 28 November 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.107005

©2009 American Physical Society

Authors & Affiliations

M. D. Lumsden1, A. D. Christianson1, D. Parshall2, M. B. Stone1, S. E. Nagler1, G. J. MacDougall1, H. A. Mook1, K. Lokshin3, T. Egami1,2,3, D. L. Abernathy1, E. A. Goremychkin4,5, R. Osborn4, M. A. McGuire1, A. S. Sefat1, R. Jin1, B. C. Sales1, and D. Mandrus1

  • 1Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 3Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 4Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom

See Also

Inelastic Neutron-Scattering Measurements of a Three-Dimensional Spin Resonance in the FeAs-Based BaFe1.9Ni0.1As2 Superconductor

Songxue Chi, Astrid Schneidewind, Jun Zhao, Leland W. Harriger, Linjun Li, Yongkang Luo, Guanghan Cao, Zhu’an Xu, Micheal Loewenhaupt, Jiangping Hu, and Pengcheng Dai
Phys. Rev. Lett. 102, 107006 (2009)

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Vol. 102, Iss. 10 — 13 March 2009

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