Experimental Study of the Low Temperature Phase Transition of Rb_2ZnCl_4
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概要
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The low temperature phase transition of Rb.ZnCI. was studied by measuringthe Raman spectra, dielectric constants and spontaneous polarization. A softmode (the B mode), whose frequency tends to zero as T.=74.6 K is approachedfrom below, was observed in addition to the totally symmetric soft mode whichhad been already' observed b':t Francke et at. No remarkable anomaly in thedielectric constants was seen around Ts. The sr>ontaneous r>olarization along thea-axis was observed both below and above Ts. From these experimental results andgroup-theoretical consideration, the phase transition at T3 is considered to beinduced by a doubly-degenerate phonon mode at the Brillouin zone boundaryof the phase III, and the space group of the phase IV below T. is guessed to ber2.11 (Z=24).
- 社団法人日本物理学会の論文
- 1981-02-15
著者
-
ISHIBASHI Yoshihiro
Synthetic Crystal Research Laboratory, Faculty of Engineering, Nagoya University
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SAWADA Akikatsu
Synthetic Crystal Research Laboratory,Faculty of Engineering,Nagoya University
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Sawada A
Muroran Inst. Technology Muroran
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WADA Mitsuo
Synthetic Crystal Research Laboratory,Faculty of Engineering,Nagoya University
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