Local Heavy Quasiparticle in Four-Level Kondo Model

DOI10.1143/JPSJ.74.3306zbMATH Open1089.82501arXivcond-mat/0509353OpenAlexW3098950532MaRDI QIDQ5291178

Yosuke Hirayama, Kazumasa Hattori, Kazumasa Miyake

Publication date: 9 May 2006

Published in: Journal of the Physical Society of Japan (Search for Journal in Brave)

Abstract: 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 SmOs${}_4$Sb${}_{12}$, some other filled-skutterudites, and clathrate compounds.

Full work available at URL: https://arxiv.org/abs/cond-mat/0509353

zbMATH Keywords

renormalization groupKondo effectnumerical renormalization grouprattlingheavy fermion

Mathematics Subject Classification ID

Renormalization group methods in equilibrium statistical mechanics (82B28)

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