Spin Waves in the (π,0) Magnetically Ordered Iron Chalcogenide Fe1.05Te

O. J. Lipscombe, G. F. Chen, Chen Fang, T. G. Perring, D. L. Abernathy, A. D. Christianson, Takeshi Egami, Nanlin Wang, Jiangping Hu, and Pengcheng Dai
Phys. Rev. Lett. 106, 057004 – Published 4 February 2011
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Abstract

We use neutron scattering to show that spin waves in the iron chalcogenide Fe1.05Te display novel dispersion clearly different from both the first principles density functional calculations and recent observations in the related iron pnictide CaFe2As2. By fitting to a Heisenberg Hamiltonian, we find that although the nearest-neighbor exchange couplings in the two systems are quite different, their next-nearest-neighbor (NNN) couplings are similar. This suggests that superconductivity in the pnictides and chalcogenides share a common magnetic origin that is intimately associated with the NNN magnetic coupling between the irons.

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  • Received 11 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.057004

© 2011 American Physical Society

Authors & Affiliations

O. J. Lipscombe1, G. F. Chen2, Chen Fang3, T. G. Perring4,5, D. L. Abernathy6, A. D. Christianson6, Takeshi Egami1,6, Nanlin Wang2, Jiangping Hu3,2, and Pengcheng Dai1,6,2,*

  • 1The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
  • 2Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 3Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
  • 4ISIS Facility, STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom
  • 5Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
  • 6Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *daip@ornl.gov

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Issue

Vol. 106, Iss. 5 — 4 February 2011

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