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 language | English |
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Article number | 114709 |
Journal | journal of the physical society of japan |
Volume | 79 |
Issue number | 11 |
DOIs | |
Publication status | Published - Nov 2010 |
Externally published | Yes |
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)