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|Type:||Artigo de periódico|
|Title:||Raman Scattering In Cmr Manganites|
|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. © 1999 Trans Tech Publications,.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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