Dispersion of the acoustic phonon concerned with C66 of KD2PO4 observed by light scattering |
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| Authors: | H Tanaka I Tatsuzaki |
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| Institution: | Research Institute of Applied Electricity, Hokkaido University, Sapporo 060, Japan |
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| Abstract: | we vector dependence of the light scattering spectra of DKDP is investigated for the scattering angles π/4, π/2 and 3π/4. Brillouin shift concerned with an elastic stiffness C66 is obtained from the angular dependence of the quasi-longitudinal and quasi-transverse mode frequencies in the ab plane observed in the VV scattering. The results indicate that the phase velocity associated with C66 decreases slightly near Ttr in the case of π/4 scattering, but does not in π/2 and 3π/4 scatterings. |
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