A new approach for the RFK model

Montenegro, Nelson Porras; Iglesias, J. R.

doi:10.1016/0378-4363(81)90977-3

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1984

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“…2 • 5 In fact, an additional approximation was introduced, Eq. (12). However, we expect that the exact computation of the mean values which appear in Eq.…”

Section: Discussionmentioning

confidence: 99%

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Green-function method for a mixed-valence Hamiltonian

1984

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A Green-function diagrammatic method is utilized to ca1cu1ate the occupation number of a narrow (j) band in a mixed-valence system. The method is a generalization of the Hubbard-1 approximation for a two-band Hamiltonian. The results at T=O K indicate the existence of an intermediate-valence state for finite hybridization between the bands, and abrupt transitions for values of G comparable to the half bandwidth of the conduction band. A metal-insulator transition is also obtained.

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“…2 • 5 In fact, an additional approximation was introduced, Eq. (12). However, we expect that the exact computation of the mean values which appear in Eq.…”

Section: Discussionmentioning

confidence: 99%

“…(6), in this preliminary version we use the additional approximation ( n{. ;nf!nt-J) ~< n{:) ( n;df) ( n;~) (12) in order to simplify the numerical computations.…”

Section: Introductionmentioning

confidence: 99%