Critical Behaviour of Specific Heat in Ferroelectric K_2ZnCl_4 and (NH_4)_2BeF_4 at Normal-Incommensurate Phase Transition
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概要
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Measurements of specific heat were carried out on structurally incommensurate ferroelectrics K_2ZnCl_4 and (NH_4)_2BeF_4 over a wide temperature region with an AC calorimetric technique. Critical indices α associated with the normal-incommensurate phase transition are obtained as 0.12±0.02 for K_2ZnCl_4 and 0.18±0.02 for (NH_4)_2BeF_4. These values do not agree with that in the 3d XY-model proposed by Bruce and Cowley, and are rather comparable with α=0.125 for the 3d Ising-model. A crossover from a logarithmic behaviour to a power-law behaviour was found at reduced temperatures t_<cr>=1×10^<-3> for K_2ZnCl_4 and 5×10^<-3> for (NH_4)_2BeF_4, respectively.
- 社団法人日本物理学会の論文
- 1993-05-15
著者
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TOKUNAGA Masaharu
Department of Physics,Faculty of Science,Hokkaido University
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Haga Hisashi
Department Of Physics Faculty Of Science Hokkaido University
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Onodera Akira
Department of Physics, Faculty of Science, Hokkaido University
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Shiozaki Yoichi
Department of Physics, Faculty of Science, Hokkaido University
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Onodera Akira
Department Of Molecular Life Science Tokai University School Of Medicine
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Tokunaga Masaharu
Department Of Physics Faculty Of Science Hokkaido University
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Haga Hisashi
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Shiozaki Y
Hokkaido Univ. Sapporo
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Shiozaki Yoichi
Department Of Physics Faculty Of Science Hokkaido University
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Haga Hisashi
Department of Biological Sciences, Graduate School of Science, Hokkaido University, North 10 West 8, Kita-ku, Sapporo 060-0810, Japan
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