ダイヤモンドにおける超伝導性は,
E A Ekimov1, V A Sidorov, E D Bauer
1Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, 142190 Troitsk, Moscow region, Russia.
Nature
|April 2, 2004
まとめ
超伝導性は,硬さと熱伝導性で知られている材料であるボロン添加ダイヤモンドで発見されました. この発見は,他のダイヤモンド構造の材料における超伝導性の可能性を開きます.
科学分野:
- マテリアルサイエンス 材料科学
- 凝縮物質物理学 凝縮物質物理学
- 固体化学 固体化学
背景:
- ダイヤモンドは,特殊な硬さ,高い熱伝導度,高い電場抵抗性を有する電気絶縁剤です.
- ボロンなどのドーピングによる電荷媒体の導入は,ダイヤモンドの電子特性を変化させる可能性があります.
- ボロンのドーピングは,ボロンの電子欠乏と小さな原子半径のために,穴のドーピングダイヤモンドを作成します.
研究 の 目的:
- 極端な条件下で合成されたボロン添加ダイヤモンドの電子特性を調査する.
- ボロン・ドーピングされたダイヤモンドで超伝導性が誘発できるかどうかを判断する.
- この新しい材料の超伝導性特性を特徴づけるために.
主な方法:
- 高圧でボロン添加ダイヤモンドの合成 (約. 100,000 atm) と高温 (2,500 2,800 K) が存在する.
- 電気抵抗力の測定. 電気抵抗力の測定. 電気抵抗力の測定.
- 磁気感受性の測定. 磁気感受性の測定. 磁気感受性の測定. 磁気感受性の測定.
- 特定の熱量測定.
- フィールド依存の抵抗測定.
主要な成果:
- ボロン・ドーピングされたダイヤモンドは,約4Kの臨界温度 (T(c)) 以下の大量型II型超伝導性を示す.
- 超伝導性は,少なくとも3.5Tの上の臨界場 (Hc2(0) までの磁場において持続する.
- 超伝導的移行は,複数の測定技術によって確認されています.
結論:
- 超伝導性は,ボロン添加ダイヤモンドで発見されました.
- この発見は,シリコンやゲルマニウムなどの他のダイヤモンド構造の材料も超伝導性を示す可能性があることを示唆しています.
- ボロン・ドーピングされたダイヤモンドは,潜在的な応用を持つ新しい大量超伝導体です.
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