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  1. 1 Acta Physica Polonica A

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  1. 1 2001

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  1. 1 Czart W.

  2. 1 Robaszkiewicz S.

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Influence of Coulomb Interactions on the Properties of Induced Pairing Model

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Czart W., Robaszkiewicz S.
Acta Physica Polonica A
|
2001
|
vol. 100
|
issue 1
75-88
EN
We study the superconducting properties of a model of coexisting itinerant carriers and local pairs with finite binding energy, taking into account the effects of Coulomb (density-density) and direct pair hopping interactions. The evolution of the phase diagrams and superfluid characteristics with electron concentration, interaction parameters and the relative position of the bands is examined. The model is found to exhibit several kinds of superconducting behaviors ranging from the BCS-like to the local-pair-like. The relevance of the obtained results to the interpretation of experimental data for the doped bismuthates (Ba_{1-x}K_xBiO_3 and BaPb_{1-x}BiO_3) is pointed out.
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