Two-dimensional magnetic interactions in LaFeAsO


Ramazanoglu M. K. , LAMSAL J., TUCKER G. S. , YAN J. -. , CALDER S., GUIDI T., ...More

PHYSICAL REVIEW B, vol.87, no.14, 2013 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 87 Issue: 14
  • Publication Date: 2013
  • Doi Number: 10.1103/physrevb.87.140509
  • Title of Journal : PHYSICAL REVIEW B

Abstract

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 AFe(2)As(2) based materials. However, the ratio of interlayer and intralayer exchange is found to be less than similar to 10(-4) in LaFeAsO, very similar to the cuprates, and similar to 100 times smaller than that found in AFe(2)As(2) 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 T-c. DOI: 10.1103/PhysRevB.87.140509