Influence of Coulomb Interactions on the Properties of Induced Pairing Model

• Authors: W. Czart , St. Robaszkiewicz
• Languages of publication: EN

Abstracts

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.

Keywords

EN

74.20.-z; 74.20.Mn; 71.28.+d; 74.25.Ha

Discipline

• 74.25.Ha: Magnetic properties including vortex structures and related phenomena(for vortices, magnetic bubbles, and magnetic domain structure, see 75.70.Kw)
• 74.20.-z: Theories and models of superconducting state
• 74.20.Mn: Nonconventional mechanisms
• 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: 2001
• Volume: 100
• Issue: 1
• Pages: 75-88

Dates

published

2001-07

received

2001-05-18

Contributors

author

W. Czart

• Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

St. Robaszkiewicz

• Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

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Identifiers

DOI

10.12693/APhysPolA.100.75