Theoretical analysis of magnetic Raman scattering in La2CuO4: Two-magnon intensity with the inclusion of ring exchange

A. A. Katanin, A. P. Kampf

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

We evaluate the Raman light- scattering intensity for the square lattice Heisenberg antiferromagnet with plaquette ring exchange J. With the exchange couplings as fixed before from an accurate fit to the spin-wave dispersion in La2CuO4, leading in particular to J = 0.24J, we demonstrate in a parameter-free calculation that the inclusion of the plaquette exchange contribution to the dispersion and the magnon-magnon interaction vertex gives a peak position in B1g scattering geometry Emax = 2.71J which is in excellent agreement with the experimental data. Yet, the intrinsic width and the line shape of the two-magnon remain beyond a description in terms of a spin-only Hamiltonian.

Original languageEnglish
Article number100404
Pages (from-to)1004041-1004044
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number10
Publication statusPublished - 15 Mar 2003
Externally publishedYes

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