Measurement of the Lattice Constant of KMnF_3 around the 186 K Phase-Transition: Determination of the Critical Exponent
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概要
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The lattice constant of KMnF_3 has been measured by means of the high-angle double-crystal X-ray diffractometry (HADOX). The relative accuracy of the lattice constant to one part in 10^6 is attained. The value of the critical exponent β for the static rotation angle of MnF_6 octahedra below the structural phasetransition temperature (186.65 K) is determined to be 0.2857±6 from the lattice constant a(T); the value is significantly smaller than 0.38 predicted for a 3D-Heisenberg system and even than 0.315 for a 3D-Ising system, with an isotropic short range interaction. This suggests that the transition occurs in the vicinity of a tricritical point. The lattice constants themselves also exhibit a critical behaviour ; the value of the critical exponents are 2β for a(T) and β for c(T).
- 社団法人日本物理学会の論文
- 1981-12-15
著者
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OKAZAKI Atsushi
Department of Anesthesiology, Juntendo University Shizuoka Hospital
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Okazaki Atsushi
Department Of Physics Kyushu University
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Okazaki Atsushi
Department Of Anesthesiology Juntendo University Shizuoka Hospital
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OHAMA Nobuhiko
Department of Physics, Kyushu University
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Ohama Nobuhiko
Department Of Physics Faculty Of Science Kyusyu University
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SAKASHITA Hirohumi
Department of Physics, Kyushu University
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Sakashita Hirohumi
Department Of Physics Kyushu University:(present Address)toshiba Corporation
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