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Two-dimensional magnetic interactions in LaFeAsO
Physical Review Letters
  • Mehmet Ramazanoglu, Iowa State University
  • J. Lamsal, Iowa State University
  • Gregory S. Tucker, Iowa State University
  • J.-Q. Yan, Oak Ridge National Laboratory
  • S. Calder, Oak Ridge National Laboratory
  • T. Guidi, Rutherford Appleton Laboratory
  • T. Perring, Rutherford Appleton Laboratory
  • R. William McCallum, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • Andreas Kreyssig, Iowa State University
  • Robert J. McQueeney, Iowa State University
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Inelastic neutron scattering measurements demonstrate that the magnetic interactions in antiferromagnetic LaFeAsO are two dimensional. Spin-wave velocities within the Fe layer and the magnitude of the spin gap are similar to the AFe2As2 based materials. However, the ratio of interlayer and intralayer exchange is found to be less than ∼10−4 in LaFeAsO, very similar to the cuprates, and ∼100 times smaller than that found in AFe2As2 compounds. The results suggest that the effective dimensionality of the magnetic system is highly variable in the parent compounds of the iron arsenides and weak three-dimensional interactions may limit the maximum attainable superconducting Tc.

This article is from Physical Review B 87 (2013): 140509(R), doi:10.1103/PhysRevB.87.140509.

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American Physical Society
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Mehmet Ramazanoglu, J. Lamsal, Gregory S. Tucker, J.-Q. Yan, et al.. "Two-dimensional magnetic interactions in LaFeAsO" Physical Review Letters Vol. 87 Iss. 14 (2013) p. 140509(R)
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