Raman Scattering Study of the Phase Mode in the Incommensurate Phase of K_2SeO_4
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概要
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Raman scattering experiment has been performed with high sensitivity forK.Se0. over a temperature range from 5 K to 135 K with special emphasis puton the observation of the phase mode in the incommensurate phase. The resulthas revealed that the phase mode in the commensurate phase becomes to ex-hibit gradually an over damped spectral profile as the commensurate-incom-mesurate phase transition temperature (7',=93 K) is approached from belowand that the overdamped mode persists even in the incommensurate phase. Ananalysis based on a damped oscillator model shows that the frequency co. of thephase mode decreases as T. is approached from below according to co.A(T. - T) with T.=121 K, while it increases slightly in the incommensurate phasewith further increasing temperature from T.. Discussion is presented in corn-parison with the existing theories.
- 一般社団法人日本物理学会の論文
- 1983-02-15
著者
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Inoue Kuon
Department Of Physics Faculty Of Science Shizuoka Uiversity
-
Ishibashi Yoshihiro
Synthehic Crystal Reseach Laboratory Faculty Of Engineering Nagoya University
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