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2008 | 113 | 1 | 287-290
Article title

Ground States of the Falicov-Kimball Model Extended by Nonlocal Coulomb Interactions

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EN
Abstracts
EN
The small-cluster exact-diagonalizations are used to study the ground states of the Falicov-Kimball model extended by nonlocal Coulomb interactions (the nearest-neighbour interaction U_{nn} and the correlated hopping t'). It is shown that the ground-state phase diagrams found for the conventional Falicov-Kimball model are strongly changed when the nonlocal interactions are added. This is illustrated for two selected values of the on-site Coulomb interaction (U) that represent typical behaviours of the model in the intermediate and strong coupling limit. A number of remarkable results are found. (i) The phase separation takes place for a wide range of U_{nn} and t' in both interaction limits. (ii) New types of inhomogeneous charge ordering are observed for nonzero U_{nn} and t'. (iii) Depending on the values of U_{nn} and t', the model is able to describe both the continuous as well as discontinuous changes of the f-electron occupation number.
Keywords
EN
Year
Volume
113
Issue
1
Pages
287-290
Physical description
Dates
published
2008-01
received
2007-07-09
References
  • 1. L.M. Falicov, J.C. Kimball, Phys. Rev. Lett. 22, 997 (1969)
  • 2. J. Freericks, V. Zlatic, Rev. Mod. Phys. 75, 1333 (2003)
  • 3. J. Wojtkiewicz, R. Lemanski, Phys. Rev. B 64, 233103 (2001);H.Čenčariková, P. Farkašovský, Int. J. Mod. Phys. B 18, 357 (2004)
  • 4. Z. Gajek, R. Lemanski, J. Magn. Magn. Mater. 272, E691 (2004)
  • 5. P. Farkašovský, Phys. Rev. B 20, 1507 (2095);Eur. Phys. J. B 20, 209 (2001)
  • 6. J. Rohler, Handbook on the Physics and Chemistry of Rare Earths, North Holland, Elsevier, 1987, p. 51 0
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv113n1070kz
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