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 |
|---|---|
| Article number | 114709 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 79 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 1 2010 |
| Externally published | Yes |
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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)
Cite this
Effect of disorder on fermi surface in heavy electron systems. / Otsuki, Junya; Kusunose, Hiroaki; Kuramoto, Yoshio.
In: Journal of the Physical Society of Japan, Vol. 79, No. 11, 114709, 01.11.2010.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of disorder on fermi surface in heavy electron systems
AU - Otsuki, Junya
AU - Kusunose, Hiroaki
AU - Kuramoto, Yoshio
PY - 2010/11/1
Y1 - 2010/11/1
N2 - 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.
AB - 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.
KW - CeLa RuSi, coherent potential approximation (CPA)
KW - Continuous-time quantum Monte Carlo (CT-QMC)
KW - Dingle temperature
KW - Large Fermi surface
KW - Metamagnetism
UR - http://www.scopus.com/inward/record.url?scp=78149313830&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78149313830&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.79.114709
DO - 10.1143/JPSJ.79.114709
M3 - Article
AN - SCOPUS:78149313830
VL - 79
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 11
M1 - 114709
ER -