CePd3におけるコヒーレント帯の刺激:中性子散乱とab initio理論の比較
Eugene A Goremychkin1, Hyowon Park2,3, Raymond Osborn4
1Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, Moscow Region, 141980, Russia.
Science (New York, N.Y.)
|January 13, 2018
まとめ
中間バレンスの化合物は,変動する局所モメントから一貫した帯域への移行を示します. 不弾性ニュートロン散乱とダイナミック平均場理論は,CePd3におけるモメンタム依存磁気反応を明らかにし,f電子相関性を確認した.
科学分野:
- 凝縮物質物理学
- 材料科学
- 量子力学
背景:
- 中間バレンスの化合物は強く相関する電子系である.
- これらの材料は,高温で不一致の局所的な瞬間から,低温で一貫したハイブリッド化帯にクロスオーバーを示すことが期待されています.
研究 の 目的:
- CePd3のダイナミック磁気感受性を調査する.
- 動的平均場理論 (DMFT) を用いたab initio計算を実験データと比較する.
- これらのシステムにおけるf電子相関の温度依存を理解する.
主な方法:
- ダイナミックな磁気感受性を探査するために,不弾性ニュートロン散乱測定が行われました.
- 動的平均場理論に基づくアブ・イニシオ計算が採用された.
- モデルを検証するために実験結果と理論結果を比較した.
主要な成果:
- CePd3の磁気反応は強烈に運動量に依存していることが判明した.
- この依存性は,低温で一貫したf電子帯の形成に起因する.
- 局所的な粒子-穴の相互作用が磁気振幅を大幅に高めることが観察されました.
結論:
- この研究は,f電子相関性について, 堅固な第一原理の理解を提供します.
- 不弾性中性子散乱とDMFT計算の間の一致は,理論的アプローチを検証する.
- この発見は,中間値化合物のクロスオーバー行動を確認した.
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