Distortion-Dependent Raman Spectra and Mode Mixing in RMnO3 Perovskites

@article{Iliev2005DistortionDependentRS,
  title={Distortion-Dependent Raman Spectra and Mode Mixing in RMnO3 Perovskites},
  author={Milko N. Iliev and Miroslav Abrashev and J. Laverdi{\`e}re and Serge Jandl and Marin M. Gospodinov and Y.-Q. Wang and Y.-Y. Sun},
  journal={arXiv: Materials Science},
  year={2005}
}
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… 

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