Influence of Magnetic Ordering on the Lattice Vibration of KNiF_3
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概要
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Lattice vibration of KniF_3 was measured in the far-infrared region as a function of temperature covering the Neel point. There exist three modes of vibration, ν_1, ν_2 and ν_3. A positive shift due to the antiferromagnetic ordering has been observed in the second mode. The analysis of the shift has given the second derivatives of the exchange integral with respect to the fluorine displacement: ∂^2J/∂υ_x^2/J≃-5/Å^2 and ∂^2J/∂υ_z^2/J≃0.8/Å^2, in which x and z are perpendicular and parallel to the Ni-F-Ni bond direction, respectively. These values show the 180° directionality of the superexchange interaction which is responsible for the antiferromagnetism of KniF_3. In addition, a slight change in the temperature coefficient of frequency has been observed at the Neel point in the highest mode ν_1, which has been compared with the volume magnetostriction measured by the strain gauge and X-ray techniques.
- 社団法人日本物理学会の論文
- 1968-07-05
著者
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Siratori Kiiti
Department Of Physics Osaka University
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Siratori Kiiti
Department Of Physics Faculty Of Science Osaka University
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TOMONO Yuzo
Institute for Solid State Physics, University of Tokyo
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Tomono Yuzo
Institute For Solid State Physics The University Of Tokyo
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SINTANI Kaduwo
Institute for Solid State Physics, The University of Tokyo
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TSUCHIDA Atsushi
Institute of Physical and Chemical Research
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Sintani Kaduwo
Institute For Solid State Physics The University Of Tokyo
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Siratori Kiiti
Department of Physics, Faculty of Science, Osaka University
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