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Yb14MnSb11の鉄磁気状態のXMCD特性について
Aaron P Holm1, Susan M Kauzlarich, Simon A Morton
1Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, USA.
Journal of the American Chemical Society
|August 15, 2002
まとめ
X線磁気円形二重性は,マンガン (Mn) がYb14MnSb11で5マイクロBのモメントを持っていることを示しています. これは,周囲のアンチモニー (Sb) の反対のモメントによって部分的にキャンセルされ,大量磁化を説明します.
科学分野:
- 凝縮物質物理学 凝縮物質物理学
- マテリアルサイエンス 材料科学
- マグネチズム (磁気) とは
背景:
- Yb14MnSb11は,Ca14AlSb11.1に同構造のインターメタリック化合物である.
- マンガンイオンは,離散的なAlSb4(9-) 四面体アニオン単位の中でアルミニウムの位置を占めています.
- このような化合物の磁気特性を理解することは,潜在的なアプリケーションにとって極めて重要です.
研究 の 目的:
- Yb14MnSb11.でマンガンの磁気モメントを実験的に決定する.
- マンガンと周囲のアンチモンのケージの間の磁気相互作用を調査するために.
- 大量の磁気化の測定値と局所磁気モメントを一致させるため.
主な方法:
- Mn L23,Sb M45,およびYb N45のエッジでのX線磁気円形の二重化 (XMCD) スペクトロスコピー.
- 大量磁気化の測定.
- 磁性イオンに関する理論的モデルとの比較.
主要な成果:
- XMCDは,Mnイオンに約5microBの局所磁気モメントがあることを確認しました.
- Sb M45エッジの弱いXMCD信号は,Sb4ケージの反対の磁気モーメントを示しています.
- Yb N45のエッジは磁気二極化を示さず,Ybの有意な局所的なモメントがないことを示唆しています.
- Mn2+のスペクトルは,Mn2+構成の理論的モデルとよく一致しています.
- 大量磁気化は,5マイクロB (Mn2+) のMnモメントによって説明され,Sbケージから部分的にキャンセルされます.
結論:
- Yb14MnSb11の磁性特性は,高スピンのd4構成 (Mn2+) のMnイオンによって支配されています.
- Mnイオンと周囲のSb4ケージの間に有意な磁気相互作用があり,部分モメントキャンセルにつながります.
- XMCDは,局所磁気瞬間と複雑な材料におけるそれらの相互作用を調査するための強力な技術です.
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