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Bi3O2S2Clで超伝導性が示されている
Bin-Bin Ruan1,2, Kang Zhao1,2, Qing-Ge Mu1,2
1Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190 , People's Republic of China.
Journal of the American Chemical Society
|February 12, 2019
まとめ
研究者達は新しいビスムート化合物である Bi3O2S2Cl を発見し,独特な [BiS2Cl]2-層を特徴としています. この材料は,硫黄含有量を調整することで,半導体から超伝導体 (2.6-3.5 K) に移行し,新しいビスムート材料への道を開きます.
科学分野:
- 固体化学
- 材料科学
- 凝縮物質物理学
背景:
- 層状のビスムートハライドは,そのユニークな構造と電子特性のために興味があります.
- 新しい層構造を 探求することで 新しい機能的素材が生まれます
研究 の 目的:
- 新しい四次バイスムート化合物を合成し,特徴づけること.
- 新しく発見された化合物の 電子特性,特に超伝導性を調査する.
- 半導体から超伝導体への移行など,組成と物理的性質の関係を探求する.
主な方法:
- 単結晶と多結晶のサンプル合成
- 構造分析のためのX線 difraktion (空間群I4/mmm,格子パラメータa = 3.927(1) Å,c = 21.720(5) Å).
- 超伝導性の測定 (臨界温度測定)
主要な成果:
- 独特の[BiS2Cl]2-層を持つ新しい四次化合物を合成した.
- この化合物は,ビスムスと塩素が無限平面層を形成する層状の構造を示している.
- 超伝導性は,多結晶と単結晶の両方で観察され,臨界温度は2. 6から3. 5Kであった.
- 超伝導性は,硫黄の含有量を減らすか,合成温度を増やすことで強化された.
- 半導体から超伝導体への移行は,硫黄含有量を調整することによって達成されました.
結論:
- [BiS2Cl]2層の発見は,ビスムートベースの化合物の探索のための新しいプラットフォームを提供します.
- Bi3O2S2Clは,半導体から超伝導体へと移行する調整可能な電子特性を示しています.
- この研究は,層状ビスムートハライドの家族と,超伝導性におけるその潜在的な応用を拡大する.
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