A simple theory of the Kondo hole
A simple theory of the Kondo hole
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近藤洞的简单理论
DOI：
10.1063/1.347971
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
P. Schlottmann
中科院分区：
文献类型：
--
作者：
R. Sollie;P. Schlottmann
近藤空穴是重费米子晶格中孤立的非磁性杂质。在实验上，近藤空穴可以通过La或Th原子取代化学计量比Ce化合物中的Ce离子或通过U-重费米子系统中的Th杂质实现。在近藤晶格中加入杂质会逐渐破坏重费米子基态的相干性。利用f电子密度可以方便地研究相干态的微扰。我们考虑了简立方晶格上无色散轨道非简并的f带与一个最近邻跳跃紧束缚导带的局部杂化。在对称情况下，杂化能隙打开，而近藤空穴在能隙中引入束缚态。研究了非磁性杂质附近的散射对f态局域密度的影响。F带内的关联效应是通过自能来引入的，用Schweitzer和Chiycho的d=∞处理，估计为U中的二阶微扰。
The Kondo hole is an isolated nonmagnetic impurity in a heavy‐fermion lattice. Experimentally, the Kondo hole can be realized by La or Th atoms replacing a Ce ion in a stoichiometric Ce compound or by Th impurities in a U–heavy‐fermion system. Adding impurities to a Kondo lattice gradually destroys the coherence of the heavy‐fermion ground state. Perturbations of the coherent state are conveniently studied in the f‐electron density of states. We consider a dispersionless orbitally nondegenerate f band locally hybridized with one nearest‐neighbor hopping tight‐binding conduction band on a simple cubic lattice. A hybridization gap opens in the symmetric case, and the Kondo hole introduces a bound state in the gap. We study the effects of the scattering on the local density of f states in the neighborhood of the nonmagnetic impurity. The effects of the correlations within the f band are introduced via a self‐energy, evaluated to second‐order perturbation in U, using the d=∞ treatment of Schweitzer and Czycho...