Raman scattering in CMR manganites

E. Granado, N. O. Moreno, A. Garcîa, J. A. Sanjurjo, C. Rettori, I. Torriani, S. B. Oseroff, J. J. Neumeier, K. J. McClellan, Sang-Wook Cheong, Y. Tokura

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Polarized Roman spectra of single and polyciystalline Lai_xSrxMnO3 ceramic samples were studied as a function of temperature. For the rhombohedral LaMnO&i and Lao.ySro.aMnOa, the observed Raman peaks were associated to modes arising from the folding of the Brillouin zone under lattice deformation. For the orthorhombic LaMnOs.o, the Raman spectra are consistent with the Pnma structure and show an anomalous softening of the 494 and 604 cm"1 modes below the antiferromagnetic ordering temperature, TV ~ 140 K.

Original languageEnglish (US)
Pages (from-to)134-138
Number of pages5
JournalMaterials Science Forum
Volume302-303
StatePublished - Dec 1 1999

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Colossal magnetoresistance
  • Frequency shifts
  • Raman effect

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