Ramen Scattering Study of the Soft Mode in Ferroelectric (CH_3NHCH_2COOH)_3CaCl_2
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概要
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Raman spectra of the soft modes have been measured in the very vicinity of thetransition temperature 7'.=131.7K in the ferroelectric phase of (CH.NHCH.COOH).CaCI.(TSCC) with scattering geometries b -c(b'F-c, b -c)bA-c and cb(c -F- b, c - b)c -F b. The longitudinal soft mode is still o bserved as an underdampedmode even just below T., whereas the transverse one is overdamped. The fern-perature dependence of dielectric constant described with the small Curie-Weissconstant is quantitatively explained by those of the two modes in terms of theLyddane-Sachs-Teller relation. The effective relaxation time of the overdampedmode is the same order of magnitude as the relaxation time obtained by dielectricdispersion. The temperature dependence of the intensity of the soft mode agreeswith the theoretical prediction based on the fact that this mode becomes Ramanactive below T..
- 社団法人日本物理学会の論文
- 1984-09-15
著者
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徳永 正晴
北大理
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KASAHARA Masaru
Research Institute of Applied Electricity,Hokkaido University
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TATSUZAKI Itaru
Research Institute of Applied Electricity,Hokkaido University
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SUGO Mitsuru
NTT Opto-electronics Laboratories
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Sugo Mitsuru
Research Institute Of Applied Electricity Hokkaido University:nippon Telegraph And Telephone Public
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Tokunaga Masaharu
Research Institute Of Applied Electricity Hokkaido University
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Kasahara M
Hokkaido Univ. Sapporo
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Kasahara Masaru
Research Institute For Electronic Science Hokkaido University
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Tatsuzaki I
Research Institute Of Applied Electricity Hokkaido University
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Tatsuzaki Itaru
Research Institute Of Applied Electricity Hokkaido University
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Kasahara Masaru
Reseach Institute For Electronic Science Hokkaido University
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TOKUNAGA Masaharu
Research Institute of Applied Electricity, Hokkaido University
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