The influence of lattice defects on the ground-state properties of the Falicov-Kimball model in two dimensions

被引：0
作者：
Zonda, M. [1 ]
Farkasovsky, P. [1 ]
Cencarikova, H. [1 ]
机构：
[1] Slovak Acad Sci, Inst Expt Phys, Kosice 04101, Slovakia
来源：
ACTA PHYSICA POLONICA A | 2008年 / 113卷 / 01期
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D O I：
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中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The influence of lattice defects (vacancies) on the ground-state properties of the spinless Falicov-Kimball model is studied by a well-controlled numerical method in two dimensions. It is shown that in the presence of vacancies (distributed randomly) the ground states of the Falicov-Kimball model are phase separated for small f-electron concentrations n(f) and exhibit the long-range order for nf near the half-filled band case n(f) = 1/2. In addition, the dependence of average f-orbital occupancy on the concentration of vacancies is calculated for a wide range of model parameters. The resultant behaviours are used to interpret the experimental data obtained for the mixed-valence system Sm1-xB6.
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页码：291 / 294
页数：4
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