Kondo Resonance Narrowing in d- and f-Electron Systems
Kondo Resonance Narrowing in d- and f-Electron Systems
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DOI：
10.1103/physrevlett.103.147205
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发表时间：
2009-10-02
影响因子：
8.6
通讯作者：
Coleman, P.
中科院分区：
文献类型：
--
作者：
Nevidomskyy, Andriy H.;Coleman, P.
我们针对洪德相互作用对近藤效应的影响开发了一种简单的标度理论，展示了近藤共振在具有大洪德相互作用的磁性离子中如何呈指数缩小。我们的理论解释了近藤温度随着亨德耦合矩的自旋 S 呈指数降低，这首先在 20 世纪 60 年代的 d 电子合金中观察到，最近在多带哈伯德模型的数值计算中遇到。我们讨论近藤共振变窄对 d 带材料（特别是铁磷族化物）莫特跃迁的影响，以及最近在铁磁相关 f 电子材料中观察到的窄 ESR 线宽。
We develop a simple scaling theory for the effect of Hund's interactions on the Kondo effect, showing how an exponential narrowing of the Kondo resonance develops in magnetic ions with large Hund's interaction. Our theory accounts for the exponential reduction of the Kondo temperature with spin S of the Hund's coupled moment, first observed in d-electron alloys in the 1960s, and more recently encountered in numerical calculations on multiband Hubbard models. We discuss the consequences of Kondo resonance narrowing for the Mott transition in d-band materials, particularly iron pnictides, and the narrow ESR linewidth recently observed in ferromagnetically correlated f-electron materials.