We observed Raman scattering from magnons in the frequency range from 10 to 65 cm[?]1 in BiFeO3 single crystals at cryogenic temperatures; temperature dependence of the magnon frequency at 18.2 cm[?]1 an S = 5/2 Brillouin function up to the temperature ([?]280 K) at which the magnon becomes overdamped. The diverging cross and the frequency shift at [?]140 and [?]200 K implies a -reorientation transition as in orthoferrites.
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Singh et al. (2008) studied this question.
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