The Influence of Lattice Defects on the Ground-State Properties of the Falicov-Kimball Model in Two Dimensions

• Authors: M. Žonda , P. Farkašovský , H. Čenčariková
• Languages of publication: EN

Abstracts

EN

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 n_f 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 Sm_{1-x}B_6.

Keywords

EN

75.10.Lp; 71.27.+a; 71.28.+d; 71.30.+h

Discipline

• 71.30.+h: Metal-insulator transitions and other electronic transitions
• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 75.10.Lp: Band and itinerant models
• 71.28.+d: Narrow-band systems; intermediate-valence solids(for magnetic aspects, see 75.20.Hr and 75.30.Mb in magnetic properties and materials)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 291-294

Dates

published

2008-01

received

2007-07-09

Contributors

author

M. Žonda

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová47, 041 01 Košice, Slovakia

author

P. Farkašovský

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová47, 041 01 Košice, Slovakia

author

H. Čenčariková

• Institute of Experimental Physics, Slovak Academy of Sciences, Watsonová47, 041 01 Košice, Slovakia

References

• 1. . L.M. Falicov, J.C. Kimball, Phys. Rev. Lett. 22, 997 (1969)
• 2. P. Farkašovský, Phys. Rev. B 52, 5463 (1995)
• 3. R. Lemański, J.K. Freericks, G. Banach, Phys. Rev. Lett. 89, 196403 (2002);C.D. Batista, Phys. Rev. Lett. 89, 166403 (2002)
• 4. Yu.B. Paderno, E.S. Konovalova, N.L. Baturinskaya, E.M. Dudnik, L.D. Finkelschtein, N.N. Efremova, IAN SSSR Neorg. Mater. 18, 47 (1982)
• 5. E.V. Nefedevova, P.A. Alekseev, E.S. Klementev, V.N. Lazukov, I.P. Sadikov, M.N. Khlopkin, M.B. Tsetlin, E.S. Konovalova, Yu.B. Paderno, JETP 88, 565 (1999)
• 6. P. Farkašovský, Eur. Phys. J. B 20, 209 (2001)

Identifiers

DOI

10.12693/APhysPolA.113.291