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In this paper, we present a detailed Raman study of the non-multiferroic compounds  PrMnO   3  and  NdMnO   3  and the multiferroic compounds  TbMnO   3  and  DyMnO   3  as a function of temperature and magnetic field. All studied systems show anomalous phonon shifts close to the Néel transition  T    N  . In  PrMnO   3  and  NdMnO   3 , the frequency softenings are partly attributed to an orbital-spin-phonon coupling whereas in  TbMnO   3  and  DyMnO   3 , the relatively weak frequency shifts are rather attributed to an expansion of the  Mn − O  bond lengths. On the other hand, the frequencies of  TbMnO   3  phonons are shifted as a function of magnetic field, while those of  PrMnO   3  remain unaffected. These frequency shifts are interpreted in terms of local oxygen rearrangements under magnetic field that could play an important role in the multiferroicity of  TbMnO   3  and  DyMnO   3 .

A comparative Raman study between PrMnO 3, NdMnO 3, TbMnO 3 and DyMnO 3