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|Type:||Artigo de periódico|
|Title:||Phonons, Polaritons, And Oblique Phonons In Liio3 By Raman Scattering And Infrared Reflection|
|Abstract:||A detailed Raman-scattering investigation of LiIO3, combined with the polarized infrared-reflectivity measurements, is reported. The dielectric constants determined by the Lyddane-Sachs-Teller (LST) relation (εxx=6.7,εzz=6.1) do not reveal any large contribution by the lattice dynamics to the low-frequency dielectric response. The high-temperature study of the TO Raman modes (till 220°C) does not show any mode "softening, " which could explain the critical dielectric behavior observed at very low frequencies. The study of the A-symmetry polariton curves has reconfirmed the LST dielectric values. The angular dispersion of the two upper oblique phonons of the A and E1 symmetry is compared with theory. The intensity dependence of these oblique phonons enables the determination of the second-harmonic- generation coefficient d13 and the linear electro-optic coefficient r13 in LiIO3. These values are compared with other published data. © 1971 The American Physical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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