Theory of Two-Magnon Raman Scattering in Iron Pnictides and Chalcogenides

C.-C. Chen, C. J. Jia, A. F. Kemper, R. R. P. Singh, and T. P. Devereaux
Phys. Rev. Lett. 106, 067002 – Published 10 February 2011

Abstract

Although the parent iron-based pnictides and chalcogenides are itinerant antiferromagnets, the use of local moment picture to understand their magnetic properties is still widespread. We study magnetic Raman scattering from a local moment perspective for various quantum spin models proposed for this new class of superconductors. These models vary greatly in the level of magnetic frustration and show a vastly different two-magnon Raman response. Light scattering by two-magnon excitations thus provides a robust and independent measure of the underlying spin interactions. In accord with other recent experiments, our results indicate that the amount of magnetic frustration in these systems may be small.

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  • Received 15 December 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.067002

© 2011 American Physical Society

Authors & Affiliations

C.-C. Chen1,2, C. J. Jia1,3, A. F. Kemper1, R. R. P. Singh4, and T. P. Devereaux1,5

  • 1Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
  • 2Department of Physics, Stanford University, Stanford, California 94305, USA
  • 3Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 4Department of Physics, University of California, Davis, California 95616, USA
  • 5Geballe Laboratory for Advanced Materials, Stanford University, California 94305, USA

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Vol. 106, Iss. 6 — 11 February 2011

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