3d金属誘導磁性オーダーリングは,磁性材料への経路としてU (IV) 原子に起因する
Vladislav V Klepov1, Kristen A Pace1, Stuart Calder2
1Department of Chemistry and Biochemistry , University of South Carolina , Columbia , South Carolina 29208 , United States.
Journal of the American Chemical Society
|February 14, 2019
まとめ
研究者は3D移行金属を加えることでウラン (IV) フッ化物における磁性オーダーリングを達成した. これにより,典型的な二磁性基本状態を抑制し,新しい磁性特性を可能にする新しいU (IV) フェリ磁性材料が生成されました.
科学分野:
- 固体化学
- マグネティズム
- 材料科学
背景:
- ウラン (IV) 5f2磁気は,通常,低温でトリプレートからシングレット基底状態への移行を示します.
- ウランの磁性基本状態を制御することは,高度な磁性材料の開発に不可欠です.
研究 の 目的:
- 複合フッ素におけるウラン (IV) 原子の磁気配列を達成する.
- ウラン (IV) フェルマグネティック材料の新シリーズを合成し,特徴づけること.
- ウラン (IV) の磁性に影響を与える3D移行金属カチオンの役割を調査する.
主な方法:
- 新しいCs2MU3F16化合物の合成 (M = Mn2+,Co2+,Ni2+).
- マグネティック・フェーズ・トランジションの測定
- 磁気構造と瞬間を明らかにする ニュートロン difraktion.
主要な成果:
- 前例のないU (IV) フェルマグネティック材料の成功合成:Cs2MU3F16
- M = Mn2+,Co2+,Ni2+ に対して低温 (4.0−14.0 K) での鉄磁気のような相変化の観測.
- ニュートロン difraktionはU磁気モメント (0.91-1.97 μB) と反パラレル3dモメント (1.53-3.26 μB) を確認した.
結論:
- 3d移行金属の組み込みは,3d-5f交換カップリングを通じてウランの磁気順序を誘導します.
- 合成された材料は,U ((IV) の特徴的な二磁性基底状態を抑制する.
- この研究は,ウラン基磁気材料の設計に新しい道を開きます.
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