Single-Particle and Magnetic Excitation Spectra of Degenerate Anderson Model with Finite f–f Coulomb Interaction
Single-Particle and Magnetic Excitation Spectra of Degenerate Anderson Model with Finite f–f Coulomb Interaction
复制标题
具有有限 f-f 库仑相互作用的简并 Anderson 模型的单粒子和磁激发谱
DOI：
10.1143/jpsj.58.3666
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发表时间：
1989
影响因子：
1.7
通讯作者：
T. Kasuya
中科院分区：
文献类型：
--
作者：
O. Sakai;Y. Shimizu;T. Kasuya
基于重整化群方法计算了杂质安德森-哈密顿量的局部单粒子、磁场和电荷激励的谱密度。在较宽的能量范围内，计算了不同大小的f - f库仑相互作用常数U f，并计算了简并因子2 ~ 5。在单粒子谱中，费米能级峰的宽度总是与磁激发能具有相当的尺度，并且永远不会大于杂化宽度。在该尖峰的BIS侧，当U f较大且f电子数中等大于1时，出现一个宽而强度大的卫星。这颗宽频卫星解释了U -化合物BIS中的带状峰，其宽度比通常的带理论大得多。
Spectral densities of local single-particle, magnetic and charge excitations are calculated for the impurity Anderson Hamiltonian based on the renormalization group approach. Calculation is made in wide range of energy and for various magnitude of f – f Coulomb interaction constant, U f , and for degeneracy factor from 2 to 5. The width of the peak at the Fermi level in the single-particle spectrum has always comparable scale to the magnetic excitation energy, and is never larger than the hybridization width. In the BIS side of this sharp peak a broad satellite with large intensity appears as a shoulder when U f is large and the f -electron number is intermediate larger than 1. The band-like peak in BIS of U -compounds, which has much larger width than that of the usual band theory, is interpreted by this broad satellite.