圧力を駆動する競争による超伝導性の強化 電子的な秩序における圧力を駆動する競争
Xiao-Jia Chen1, Viktor V Struzhkin, Yong Yu
1Geophysical Laboratory, Carnegie Institution of Washington, Washington DC 20015, USA. xjchen@ciw.edu
Nature
|August 21, 2010
まとめ
超伝導体におけるより高い移行温度 (T ((c)) を発見することは困難です. この研究では,圧力が競合する電子順序を抑制することによって,三層の銅酸化物におけるT (c) を強化できることを明らかにしています.
科学分野:
- 凝縮物質物理学 凝縮物質物理学
- マテリアルサイエンス 材料科学
- 超伝導性は超伝導性である.
背景:
- 超伝導体トランジション温度 (T ((c)) の強化は,重要な課題です.
- 反鉄磁気のような競合する電子秩序は,しばしば超伝導性を抑制する.
- 多層の銅酸化物は競合する順序を示しているが,抑制によるT (c) 強化は不明である.
研究 の 目的:
- 三層Bi2Sr2Ca2Cu3O10+デルタ (Bi2223) の圧力誘発相競争を調査する.
- 競合する電子状態を抑制することで,この高温超伝導体内のT (c) を強化できるかどうかを判断する.
- 圧力,競合する順序,および超伝導性の関係を探求する.
主な方法:
- 最適にドーピングされた三層 Bi2223.3 に施された水立圧.
- 圧力の関数として測定された超導体移行温度 (T(c)) です.
- 圧力駆動フェーズ競争とその超伝導性への影響を分析した.
主要な成果:
- 圧力の増加に伴い,T (c) の異常な2段階の強化が観察されました.
- T (c) は当初増加し,その後減少し,その後, ~24 GPaを超えるさらなる増加が続いた.
- 第2のT (c) 強化は,内部のCuO (c) 2) 平面のクロスオーバーを示唆しています.
結論:
- 圧力を駆動するフェーズ競争は,多層のHTSCでTを大幅に高めることができます.
- この発見は,競合する順序と超伝導性の複雑な相互作用を強調しています.
- この研究は,銅酸化物超伝導体におけるより高いT (c) を達成するための新しい経路を提供します.
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