Superconductivity and characterization of the high-pressure reaction products of carbon diselenide, CSe2.
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概要
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The physical properties and the structure of black solids obtained by the high-pressure reaction of CSe<SUB>2</SUB> were examined by IR, X-ray diffraction, scanning electron microscope, electron diffraction, thermal analyses and magnetic experiments. The crystalline solid, which was metallic (σ(<I>RT</I>)≈50 S cm<SUP>−1</SUP>) at ambient pressure became superconductor above 20 GPa(<I>T</I><SUB>c</SUB>(onset)=6 K), while the amorphous solid was insulating. Contrary to the previously proposed one- or two-dimensional polymerization structure of (CSe<SUB>2</SUB>)<I><SUB>x</SUB></I>, it has been revealed that the metallic CSe<SUB>2</SUB> sample have a rather complex structure that is composed of the crystalline hexagonal Se, graphite and some amorphous parts. Thus, the high conductivity and the diamagnetism of the crystalline solid at ambient pressure seems to come from graphite part and the superconductivity seems to come from hexagonal Se part. The superconducting transition behavior depended on the path of the pressure-cooling steps. The superconducting state was observed only when the pressure was increased at the low temperature.
- 公益社団法人 日本化学会の論文
著者
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Kato Reizo
Department Of Chemistry Faculty Of Science Saitama University
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IKEHATA Seiichiro
Department of Applied Physics, Faculty of Science, Science University of Tokyo
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Kawamura Haruki
National Research Institute For Metals
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Kobayashi Hayao
Department Of Chemistry Faculty Of Science Toho University
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Kishida Haruo
Nissei Sangyo Co. Ltd.
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Kobayashi Akiko
Department Of Biopharmaceutics Meiji Pharmaceutical University
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Sasaki Yukiyoshi
Department of Chemistry, Faculty of Science, The University of Tokyo
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Watanabe Tokuko
The University of the Air
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Sasaki Yukiyoshi
Department of Chemistry and The Research Centre for Spectrochemistry, Faculty of Science, The University of Tokyo
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Kato Reizo
Department of Chemistry, Faculty of Science, Toho University
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