## Abstract

We study magnetic properties of a single-impurity Anderson model in the symmetric case, in which the density of states for conduction electrons vanishes in a finite energy gap containing the Fermi energy. A quantum Monte Carlo simulation at finite temperatures and low-energy excitations calculated by a numerical renormalization group method reveal that at low temperatures the impurity magnetic susceptibility follows Curie's law. This behavior is consistent that the ground state is a doublet. The low-temperature Curie constant decreases monotonically with decreasing energy gap and the critical point is the zero gap. In the narrow gap limit, the impurity g-value of the doublet state is proportional to the gap width. This situation is due to the special feature of the symmetric case.

Original language | English |
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Pages (from-to) | 3443-3446 |

Number of pages | 4 |

Journal | journal of the physical society of japan |

Volume | 61 |

Issue number | 10 |

DOIs | |

Publication status | Published - 1992 Oct |

## Keywords

- Kondo effect
- nonmetallic system
- numerical renormalization group method
- quantum Monte Carlo method

## ASJC Scopus subject areas

- Physics and Astronomy(all)