Role of approximation scheme for phase transition within extended Falicov-Kimball model

Zieliński, J.; Trzaskoma, P.

doi:10.1016/0038-1098(82)90156-9

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Occupation Number For F-electrons1

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1983

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“…(nP> as a function of E . This means that for large values of W , when SHP seems to be justified, the Coulomb correlation which is believed to drive the discontinuous transition becomes ineffective and there are no abrupt changes in (n'), as argued in [13] for the finiteband case.…”

Section: Occupation Number For F-electronsmentioning

confidence: 90%

On the two‐site spinless Falicov‐Kimball model with hybridization

Zieliński

Kowalska

1983

Physica Status Solidi (b)

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The exactly solvable two-site extended Falicov-Himball model is considered. It is shown that the increase of hopping energy lowers the tendency to an abrupt change of the average occupation number of f-electrons. Some thermodynamic quantities are evaluated. The results are used for the alloy analogy coherent potential approximation treatment of the periodic model.Das exakt losbare erweiterte Zwei-Platz-Falicov-IGmball-Modell wird untersucht. Es wird gezeigt daB das Anwachsen der Hopping-Energie die Tendenz zu einer abrupten h d e r u n g der mittleren, Besetzungszahl der f-Elektronen verringert. Einige thermodynamischen GroBen werden berechnet. Die Ergebnisse werden zur analogen kohiirenten Potentialniiheningsbehandlung des periodischen Modells einer Legierung benutzt.

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Section: Occupation Number For F-electronsmentioning

confidence: 90%