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CeIrIn₅における重フェルミオン超伝導性の空間制御

Maja D Bachmann^1,2, G M Ferguson³, Florian Theuss³

¹Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany.

Science (New York, N.Y.)

|October 12, 2019

まとめ

研究者は重フェルミオン材料の超伝導性をミクロメートルのスケールで制御することができました. 焦点化されたイオンビームの磨きは,材料の質を劣化させずに超伝導状態をパターニングし,不均一なストレスを誘導した.

科学分野:

凝縮物質物理学
材料科学
量子材料について

背景:

強く相関する金属は様々な電子基底状態を宿している.
これらの電子状態を空間的に制御することは依然として大きな課題です.
CeIrIn5のような重フェルミオン超伝導体は外部刺激に敏感な複雑な行動を示します

研究の目的:

超伝導特性を空間的に調節するための新しい方法を実証する.
超伝導状態をマイクロスケールで制御する
CeIrIn5における超伝導性に対する技術的なストレンスフィールドの影響を調査する.

主な方法:

焦点イオンビーム (FIB) の磨きは,CeIrIn5の結晶のパターンを用いた.
境界条件を調整すると,冷却時に不均一な張力場が生じます.
超伝導的移行温度を張力の関数として測定した.

主要な成果:

超伝導状態のミクロメートルのスケールでの制御が達成されました.
超伝導性の複雑なパターンを作り出した
移行温度は,ストレスの大きさと方向に強く依存しています.

結論:

FIB誘発のストレンは量子材料の電子順序を操作するための一般的なアプローチを提供します
この方法は,材料の完全性を損なうことなく正確な制御を可能にします.
この発見は超伝導装置の設計と設計に新たな道を開きます

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