Magnon Spectrum of Alpha Oxygen

The far-infrared absorption in solid alpha oxygen at 27 ${\mathrm{cm}}^{\ensuremath{-}1}$ is shown to be definitively associated with the magnetic rather than orientational ordering in the crystal. A second magnetic excitation has been found at 6.5 ${\mathrm{cm}}^{\ensuremath{-}1}$. The properties of both absorptions are described using the excitation-wave formalism.

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