Brillouin Scattering Study of the Successive Phase Transitions in K_2SeO_4
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概要
- 論文の詳細を見る
The Brillouin scatterinx sr>ectra of KzSe0+ were observed as a function oftemrerature in a ranse from 80 K to 770 K which includes the three successiver:>hase transition r>oints Tr (745.0 KG, To (129.5 K) and Ts (93.0 K). The Brillouinfrectuencv shifts Just below the hexasonal-orthorhombic (r>rototvr>e-normaa>transition r>oint Ts show a softeninx of the lonsitudinal acoustic (LA) moaer:>roranatins alonu the [1001 direction. The index 2I=O.64-#O.02 was obtainedin a phenomenological treatment of the anomalous nart of the elastic stiffnessconstant Co 1 derived from the frectuencv shift. At the normal-incommensuratetransition point r., the LA mode propagating along true [0011 direction showsan anomaly of C.3 which is well described in terms of the mean-field theory,Near the incommensurate-commensurate transition point T., the spectra do notshow any anomalous temperature dependence.
- 社団法人日本物理学会の論文
- 1981-02-15
著者
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YAGI Toshirou
Department of Physics,Kyushu University
-
Yagi Toshirou
Department Of Physics Faculty Of Science Kyushu University
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Cho Masanori
Department Of Physics Kyushu University
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