Local heavy quasiparticle in four-level Kondo model
Local heavy quasiparticle in four-level Kondo model
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DOI：
10.1143/jpsj.74.3306
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发表时间：
2005-12-01
影响因子：
1.7
通讯作者：
Miyake, K
中科院分区：
文献类型：
--
作者：
Hattori, K;Hirayama, Y;Miyake, K
利用微扰重整化群方法和数值重整化群方法研究了杂质四能级Kondo模型，其中离子在四个稳定点之间隧穿并与周围的传导电子相互作用.数值重整化群研究表明，如果考虑传导电子与离子的相互作用，可以构造出包含离子激发态的基态波函数。由此产生的准粒子的有效质量适度增强。这一结果提供了一个很好的解释增强和磁鲁棒索末菲系数观察SmOs4Sb 12，其他一些填充方钴矿，和笼形化合物。
An impurity four-level Kondo model, in which an ion is tunneling among 4-stable points and interacting with surrounding conduction electrons, is investigated using both perturbative and numerical renormalization group methods. The results of numerical renormalization group studies show that it is possible to construct the ground state wavefunction including the excited ion states if we take into account the interaction between the conduction electrons and the ion. The resultant effective mass of quasiparticles is moderately enhanced. This result offers a good explanation for the enhanced and magnetically robust Sommerfeld coefficient observed in SmOs4Sb12, some other filled-skutterudites, and clathrate compounds.