カルコピライトCuFeS2におけるn型およびp型伝導間の圧力駆動可逆切り替え
Ting Wen1, Yonggang Wang1, Nana Li1
1Center for High Pressure Science and Technology Advanced Research (HPSTAR) , Beijing 100094 , China.
Journal of the American Chemical Society
|November 29, 2018
まとめ
圧力は,カルコピライトCuFeS2におけるp型とn型伝導の間の可逆的な切り替えを誘導する. この半導体から半導体への移行は,構造的な相変化と材料のスピンクロスオーバーに関連しています.
科学分野:
- 材料科学
- 凝縮物質物理学
- 固体化学
背景:
- Agベースの半導体では,温度依存の伝導型スイッチングはまれである.
- 圧力は,移行金属半導体における集団現象を誘導する効果的な刺激である.
研究 の 目的:
- カルコピライトCuFeS2における圧力を駆動する伝導型スイッチングを調査する.
- 圧力下における構造的,電子的,スピンの性質の関係を理解する.
主な方法:
- ダイアモンド・アンビル・セルを使った高圧実験
- 構造分析のためのX線微分
- 電子特性の光電流とホール係数の測定
- バレンスの状態の決定のためのX線吸収スペクトロスコーピー (XAS).
主要な成果:
- CuFeS2は,約8GPaの回転性p型からn型への伝導性を示しています.
- 空間群I-42dからI-4への構造的相移行は,FeS4四面体体積の縮小で発生する.
- Fe2+の高低スピンクロスオーバー (S=2からS=0) が相変化に伴います.
- バレンスの分布はCu2+Fe2+S2であり,カチオン電荷の移転はありません.
結論:
- CuFeS2では新しい圧力駆動型p-n伝導スイッチング現象が観察された.
- このスイッチングは,圧力誘発の構造的フェーズ移行とスピンクロスオーバーと関連しています.
- CuFeS2は,新しい圧力反応性電子機器の開発に有望な材料です.
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