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|Type:||Artigo de periódico|
|Title:||The Ferroelectric Mode In Orthorhombic Knbo3|
|Abstract:||Both Raman scattering and infrared reflectivity measurements have been performed to determine the complete optic mode spectrum of orthorhombic KNbO3 and characterize the ferroelectric modes. The low frequency, k ∼ 0 mode is quasitransverse and possesses a spacial anisotropy similar to the TA branch at finite k. Of the original cubic ferroelectric mode, the component along the remaining soft direction is found at 56 cm-1 and not overdamped (Γ/ω = 1), while the other two components have stiffened equally so that the mode is essentially isotropic in the orthogonal polarizations. © 1975.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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