Spin dynamics in La2CuO4: Consistent description by the inclusion of ring exchange

A. Kampf, A. A. Katanin

Research output: Contribution to journalConference articlepeer-review

Abstract

We consider the square lattice Heisenberg antiferromagnet with plaquette ring exchange (J) to investigate the spin dynamics in La 2CuO4. The values for the in-plane exchange parameters, J=151.9 meV and J=0.24 J, are obtained consistently by an accurate fit to the experimentally observed spin-wave dispersion. In a parameter-free calculation for the Raman light scattering intensity we find that the inclusion of ring exchange in the dispersion and the magnon-magnon interaction vertex leads to a 2-magnon peak position in B1g geometry which agrees perfectly with the experimental value.

Original languageEnglish
Pages (from-to)311-312
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume408-410
Issue number1-4
DOIs
Publication statusPublished - Aug 2004
Externally publishedYes
EventProceedings of the International Conference on Materials - Rio de Janeiro, Brazil
Duration: 25 May 200330 May 2003

Keywords

  • Magnetic Raman scattering
  • Ring-exchange
  • Spin waves

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