超原子電荷密度波を集積した超伝導体 Au₆Te₁₂Se₈

Xu Chen¹, Ge Fei², Yanpeng Song¹

¹Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Journal of the American Chemical Society

|October 27, 2022

まとめ

Au6Te12Se8のような超原子結晶は,超原子電荷密度波 (S-CDW) と超伝導性の間の圧力誘発競争を示している. 外部の圧力は超伝導性の新段階を明らかにし移行温度が上昇した.

科学分野:

凝縮物質物理学
材料科学
ナノテクノロジー

背景:

超原子結晶は原子的に正確なクラスターから作られた階層的な材料です.
Au6Te12Se8は,超原子電荷密度波 (S-CDW) を示す全無機超伝導体である.

研究の目的:

超原子結晶における外圧に対するS-CDWと超伝導性の反応を調査する.
Au6Te12Se8における圧力誘発の相変化と伝導性の変化を理解する.

主な方法:

シンクロトロンX線微分法
理論的な計算だ
圧力の変化による輸送測定

主要な成果:

S-CDWは,外圧への反応のために低い圧力値 (0.1GPa) を表しています.
第二の超伝導相は7.3GPa以上で発生し,過渡温度 (Tc) を8.5Kに上昇させる.
圧力は超原子の滑りとフェルミ表面のトポロジック移行を引き起こし,導電性の次元交差を引き起こします.

結論:

Au6Te12Se8は,S-CDWと超伝導性の間の圧力依存のユニークな相互作用を示しています.
観測された再入力超伝導性は,導電性とフェルミ表面トポロジーの次元クロスオーバーに関連しています.
超原子結晶は圧力の下で量子現象を探求するための新しいプラットフォームを提供します

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