Effect of disorder on fermi surface in heavy electron systems

Junya Otsuki, Hiroaki Kusunose, Yoshio Kuramoto

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The Kondo lattice model with substitutional disorder is studied with attention to the size of the Fermi surface and the associated Dingle temperature. The model serves for understanding heavy-fermion Ce compounds alloyed with La according to substitution CexLa1-x. The Fermi surface is identified from the steepest change of the momentum distribution of conduction electrons, and is derived at low enough temperature by the dynamical mean-field theory (DMFT) combined with the coherent potential approximation (CPA). The Fermi surface without magnetic field increases in size with decreasing x from x = 1 (Ce end), and disappears at such x that gives the same number of localized spins as that of conduction electrons. From the opposite limit of x = 0 (La end), the Fermi surface broadens quickly as x increases, but stays at the same position as that of the La end. With increasing magnetic field, a metamagnetic transition occurs, and the Fermi surface above the critical field changes continuously across the whole range of x. The Dingle temperature takes a maximum around x = 0:5. Implication of the results to experimental observation is discussed.

Original languageEnglish
Article number114709
Journaljournal of the physical society of japan
Volume79
Issue number11
DOIs
Publication statusPublished - Nov 1 2010
Externally publishedYes

Keywords

  • CeLa RuSi, coherent potential approximation (CPA)
  • Continuous-time quantum Monte Carlo (CT-QMC)
  • Dingle temperature
  • Large Fermi surface
  • Metamagnetism

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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