Superconductivity, Charge Orderings and Phase Separations in Systems with Local Electron Pairing

• Authors: S. Robaszkiewicz , G. Pawłowski
• Languages of publication: EN

Abstracts

EN

We study two effective models developed for description of superconductors with short-coherence length: (i) the extended Hubbard model with on-site attraction and intersite repulsion, (ii) the model of hard-core charged bosons on a lattice. The analysis is concentrated on the problem of phase separations and competition between superconductivity (SS) and charge-density-wave (CDW) orderings. The phase diagrams of the systems are shown to consist of at least seven different states, including 3 types of phase separated (PS) states: CDW-SS (PS1), CDW-normal (PS2) and the state of electron droplets (PS3). By taking into account the PS states and the effects of longer-range density-density interactions (beyond nearest neighbors) our paper substantially generalizes and modifies the conclusions of previous papers concerning the models considered.

Keywords

EN

74.20.-z; 05.30.Jp; 71.28.+d

Discipline

• 74.20.-z: Theories and models of superconducting state
• 05.30.Jp: Boson systems(for static and dynamic properties of Bose-Einstein condensates, see 03.75.Hh and 03.75.Kk; see also 67.10.Ba Boson degeneracy in quantum fluids)
• 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)

• Journal: Acta Physica Polonica A
• Year: 1996
• Volume: 90
• Issue: 3
• Pages: 569-586

Dates

published

1996-09

received

1996-06-24

Contributors

author

S. Robaszkiewicz

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

author

G. Pawłowski

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

Identifiers

DOI

10.12693/APhysPolA.90.569