Distortion-Dependent Raman Spectra and Mode Mixing in RMnO3 Perovskites

  title={Distortion-Dependent Raman Spectra and Mode Mixing in RMnO3 Perovskites},
  author={M. Iliev and M. Abrashev and J. Laverdi{\`e}re and S. Jandl and M. Gospodinov and Y. Wang and Y. Sun},
  journal={arXiv: Materials Science},
  • M. Iliev, M. Abrashev, +4 authors Y. Sun
  • Published 2005
  • Physics
  • arXiv: Materials Science
  • The polarized Raman spectra of orthorhombic RMnO3 series (R=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Y) were studied at room temperature. The variation of phonon frequencies with R ionic radius rR as a whole confirms the commonly accepted Raman line assignments with two noticeable exceptions: (1) with decreasing rR the stretching Ag(1) and bending Ag(3) modes strongly mix for R=Sm to Tb, while for further decrease or rR (R=Dy,Ho,Y) the Ag(3) mode is observed at higher frequency than Ag(1) mode; (2) similar… CONTINUE READING
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