Polarized Raman studies on oriented single crystals of La2Cu04 yield a ,,spectra with narrow lines at 429 and 228 cm'that are identi6ed as the two Rig modes expected for the tetragonal K2NiF4 structure: a ,,, spectra with one line at 228 cm'that has Eg symmetry; and a spectra with numerous peaksthat are due to normally forbiddenphonon excitations. The a, spectra also show strong second-orderfeatures, suggesting a highly anisotropic, excitonlike enhancement of the Raman scattering.
Evidence for anisotropic excitonlike enhancement of the Raman scattering from La2CuO4
BE Watts
1988
Abstract
Polarized Raman studies on oriented single crystals of La2Cu04 yield a ,,spectra with narrow lines at 429 and 228 cm'that are identi6ed as the two Rig modes expected for the tetragonal K2NiF4 structure: a ,,, spectra with one line at 228 cm'that has Eg symmetry; and a spectra with numerous peaksthat are due to normally forbiddenphonon excitations. The a, spectra also show strong second-orderfeatures, suggesting a highly anisotropic, excitonlike enhancement of the Raman scattering.File in questo prodotto:
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