Raman scattering studies of hexagonal rare-earth RMnO3 (R = Tb, Dy, Ho, Er) thin films

Nguyen Thi Minh Hien, Su Young Oh, Xiang Bai Chen, D. Lee, S. Y. Jang, T. W. Noh, In Sang Yang

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15 Scopus citations

Abstract

We have studied the rare-earth (R) dependence of the phonon and magnon scattering in hexagonal RMnO3 (R = Tb, Dy, Ho, Er) thin films using Raman scattering spectroscopy. We found, as the ionic radius of R decreases from Tb to Er, the phonons shift to higher energies. Our results indicate that both the lattice constants a and c of hexagonal RMnO3 would decrease when the ionic radius of R decreases, and the lattice constant c would have a weaker R dependence. The magnons also shift to higher energies when the radius of the R ion decreases, and they show faster upshift than the phonons. In addition, the Néel temperature also shows a systematic increasing behavior when the radius of the R ion decreases. The dependence of the rare-earth R on the magnons and the Néel temperature can be explained by the rapid increase of the spin-exchange integral when the Mn-Mn distance decreases.

Original languageEnglish
Pages (from-to)1774-1779
Number of pages6
JournalJournal of Raman Spectroscopy
Volume42
Issue number9
DOIs
StatePublished - Sep 2011

Keywords

  • hexagonal RMnO
  • magnon scattering
  • Néel temperature
  • phonon scattering
  • spin-exchange integral

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