Light scattering studies on structural phase transitions |
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| Authors: | Terutaro Nakamura Yasunori Tominaga Masayuki Udagawa Seiji Kojima Masaaki Takashige |
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| Institution: | The Institute for Solid State Physics, The University of Tokyo, Tokyo 106 Japan |
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| Abstract: | A method of analyzing the overdamped polariton spectra have been developed. Polariton dispersion curves of the soft E-mode in BaTiO3 have been obtained. By observing polariton peaks of KDP, low-frequency B2(z) response has been concluded to be oscillatory. Pure E-TO plateau response of KDP has been attributed to the proton motion of E-symmetry in x-y plane. The phase transition in LiNH4C4H4O6·H2O has been identified to be the intrinsic ferroelastic transition, by observing a soft acoustic phonon and by comparing with KDP. High pressure polarized Raman spectra of a single domain BNN crystal have been observed using a diamond anvil cell. |
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