Scaling analysis of a model Hamiltonian for Ce$^{3+}$ impurity in a cubic metal

TL;DR

This paper analyzes a comprehensive model Hamiltonian for Ce$^{3+}$ ions in cubic symmetry, exploring various exchange interactions and their stability using perturbative renormalization group methods.

Contribution

It introduces and examines multiple exchange interaction models, including a novel one-channel $S_c=3/2$ Anderson model, and analyzes their fixed points and stability.

Findings

Identification of stable fixed points for different exchange interactions.

Discovery of a non-trivial fixed point in the $S_c=3/2$ Anderson model.

Insights into the stability of impurity models in cubic symmetry.

Abstract

We introduce various exchange interactions in a model Hamiltonian for Ce$^{3+}$ ions in cubic symmetry with three configurations ($f^0$,$f^1$,$f^2$). With the impurity pseudo spin $S_I=1/2$, our Hamiltonian includes: (i) One-channel $S_c=1/2$ Anderson model; (ii) Two-channel $S_c=1/2$ Anderson model; (iii) An unforseen one-channel $S_c=3/2$ Anderson model with a non-trivial fixed point; (iv) Mixing exchange interaction between the $\Gamma_{6,7}$ and the $\Gamma_8$ conduction electron partial wave states; (v) Multiple conduction electron partial wave states. Using the third-order scaling (perturbative renormalization group) analysis, we study stability of various fixed points relevant to various exchange interactions for Ce$^{3+}$ ions in cubic symmetry.