750ギガパスカル以上の静的圧力で最も圧縮できない金属オスミウム
L Dubrovinsky1, N Dubrovinskaia2, E Bykova1,2
1Bavarian Research Institute of Experimental Geochemistry and Geophysics, University of Bayreuth, D-95440 Bayreuth, Germany.
Nature
|August 25, 2015
まとめ
メタリックオスミウム (Os) は770ギガパスカルまで密集した六角形のままです. ユニットセルパラメータ比の異常は 電子の移行を示唆し, 極度の圧力下でのコア電子の相互作用を含みます.
科学分野:
- 材料科学
- 凝縮物質物理学
- 高圧物理学
背景:
- 金属オスミウム (Os) は,高密度および融解温度などの特殊な性質を有しています.
- 高圧下での動作はよくわかっていないが,研究では75ギガパスカル以下に限られている.
研究 の 目的:
- 先進的な実験技術を用いて金属オスミウムの高圧行動を調査する.
- オスミウムの構造と電子の変化を 理解する
主な方法:
- ダイヤモンド・アンビル・セルを用いたオスミウムの粉末X線分光測定
- 金,プラチナ,およびの自己一貫した状態方程式を介して500ギガパスカルまでの正確な圧力決定.
- ダイナミック・メアフィールド理論の計算
主要な成果:
- オスミウムは770ギガパスカルまで 密集した六角構造を保ちます
- ユニットセルパラメータ比の異常は150と440ギガパスカルの間で観察されました.
- 150ギガパスカルの異常はフェルミ表面のトポロジカル変化と関連しており,440ギガパスカルの異常は,コア電子の相互作用を伴う可能性があります.
結論:
- 高圧実験では オスミウムの複雑な構造と 電子的振る舞いを明らかにしました
- 圧力が誘発されたコア電子相互作用は,圧縮不可能な金属で可能である.
- この研究により 極度の圧縮下での物質の新たな状態を 探求する道が開けます
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