超伝導性は,ネール状態から無限段階の単層コプレート La[公式:テキストを参照]CuO[公式:テキストを参照]に発生する
Yoshihiko Ihara1, Ramender Kumar2, Kota Miyakoshi2
1Department of Physics, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan. yihara@phys.sci.hokudai.ac.jp.
Scientific reports
|August 27, 2025
まとめ
超伝導性は,単層のカップレート,La[Formula: テキストを参照]CuO[Formula: テキストを参照]内の均一なネール状態で発生する. これは制御された酸素分布で発生し,銅酸化物における磁気秩序と超伝導性の共存に関する以前の理解に挑戦しています.
科学分野:
- 凝縮物質物理学
- 材料科学
- 固体化学
背景:
- 抗鉄磁性と超伝導性は,低ドーピングレベルでの単一のCuO [公式:テキストを参照してください]層のカップレートでしばしば共存します.
- これらの材料には化学的障害があり,相共存に影響を与えます.
研究 の 目的:
- 単層のカップレート内の均等にオーダーされたネール状態での超伝導性を調査する.
- 顕微鏡の相共存を実現する酸素の均一な分布の役割を示す.
主な方法:
- 核四極共鳴測定を用いた.
- 研究されたLa[Formula: テキストを参照]CuO[Formula: テキストを参照]は,少量の過剰な酸素 [Formula: テキストを参照].
主要な成果:
- 超伝導性は,均一で完全なネール状態で観察されました.
- 均一な酸素分布は,顕微鏡相共存に不可欠であることが判明しました.
- 移動性酸素原子によって駆動される自己組織化された周期的酸素配列が特定されました.
結論:
- 超伝導性は,かなりの磁気モーメントと低いキャリア密度で堅固なネール状態で発生します.
- この発見は,クプレートにおける超伝導性のメカニズムを再検討するよう促した.
- 酸素の均一な配分は 混合性のギャップとステージの不安定性を克服する鍵です
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