Quantum Monte Carlo and Numerical Renormalization Group Studies of Magnetic Impurities in Nonmetallic Systems

Katsuhiko Takegahara, Yukihiro Shimizu, Osamu Sakai

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

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 languageEnglish
Pages (from-to)3443-3446
Number of pages4
Journaljournal of the physical society of japan
Volume61
Issue number10
DOIs
Publication statusPublished - 1992 Oct

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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