Lattice Vibrations of Magnetic Semiconductor Chalcogenide Spinels, Hg_xZn_<1-x>Cr_2Se_4
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概要
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The infrared absorption spectra due to the lattice vibrations and the intrinsic transitions in mixed crystals, Hg_xZn_<1-x>Cr_2Se_4 have been studied for x=0∼1. Four absorption bands of fundamental lattice vibrations were observed in pure crystals for x=0 amd 1, and five intense absorption bands were observed in mixed crystals. The concentration dependence of the three bands shows one-mode type behaviour, whereas that of the other two bands shows two-mode type behaviour. In addition to these bands, a few weak absorption bands were found near the two-mode type absorption bands. The concentration dependence of lattice vibration frequencies is interpreted by a simple model which takes into consideration the six force constants. The main features of the model are that the two force constants and the mass relating to the Hg site are varied continuously with the Hg concentration and that two kinds of clusters are taken into consideration. For these crystals, the positions of the fundamental absorption edges shift linearly toward lower energy side with the Hg concentration, and the lattice constants determined from X-ray analysis in mixed crystals obey Vegard's law.
- 社団法人日本物理学会の論文
- 1973-11-05
著者
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ONARI Seinosuke
Institute of Applied Physics, The University of Tsukuba
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ARAI Toshihiro
Institute of Applied Physics, The University of Tsukuba
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KUDO Keiei
Institute for Optics, Tokyo Kyoiku University
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Kudo Keiei
Institute For Optical Research Tokyo Kyoiku University
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Kudo Keiei
Institute For Optical Research Tokyo University Of Education
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Kudo Keiei
Institte For Optical Research Kyoiku University
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Arai Toshihiro
Institute For Optical Research Tokyo Kyoiku University
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Arai Toshihiro
Institute For Optical Research Kyoiku University
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Arai Toshihiro
Institute For Optical Research Tokyo University Of Education
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Onari Seinosuke
Institute For Optical Research Tokyo University Of Education
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WAKAMURA Kunio
Institute for Optical Research, Tokyo Kyoiku University
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TAKAHASHI Tatuso
RCA Research Laboratories
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Wakamura Kunio
Institute For Optical Research Tokyo Kyoiku University:(present Address) Department Of Fundamental N
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Arai Toshihiro
Institte For Optical Research Kyoiku University
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Wakamura Kunio
Institte for Optical Research, Kyoiku University
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