Green function theory of magnon sideband shapes in antiferromagnetic crystals
J B Parkinson; R Loudon; J B Parkinson; Physics Department, University of Essex; R Loudon; Physics Department, University of Essex
Журнал:
Journal of Physics C: Solid State Physics
Дата:
1968-12-01
Аннотация:
Green function methods are used to include the effects of exciton-magnon interaction in a calculation of the shapes of magnon sidebands on narrow exciton lines in antiferromagnets. The general theory is applied to RbMnF<sub>3</sub>, for which crystal numerical results are presented. It is found that good agreement with experimental results for the <sup>6</sup>A<sub>1</sub> to <sup>4</sup>T<sub>1</sub> exciton transition can be obtained if the exchange constant between a neighbouring <sup>6</sup>A<sub>1</sub>-<sup>4</sup>T<sub>1</sub> pair of manganese ions is about one-half of the exchange constant for a <sup>6</sup>A<sub>1</sub>-<sup>6</sup>A<sub>1</sub> pair.
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