Spin-dependent mass enhancement under a magnetic field in the periodic Anderson model

Seiichiro Onari, Hiroshi Kontani, Yukio Tanaka

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

In order to study the mechanism underlying the mass enhancement in heavy-fermion compounds in the presence of a magnetic field, we study the periodic Anderson model by using the fluctuation exchange approximation. The resulting mass enhancement factor can have a value up to 10, which is significantly larger than that in the single-band Hubbard model. We show that the difference between the magnitude of the mass enhancement factor of up-spin (minority spin) electrons z-1 and that of down-spin (majority spin) electrons z-1 increases with the applied magnetic field B ∥ z, which is consistent with the de Haas-van Alphen measurements for CeCoIn5, CeRu2Si2, and CePd2Si2. We predict that z-1 > z-1 in many Ce compounds, whereas z -1 < z-1 in Yb compounds.

Original languageEnglish
Article number023703
Journaljournal of the physical society of japan
Volume77
Issue number2
DOIs
Publication statusPublished - Feb 1 2008

Keywords

  • CeCoIn
  • FLEX
  • Periodic Anderson model

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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