Superconducting Properties of theη-Pairing State in the Penson-Kolb-Hubbard Model

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

Abstracts

EN

The Penson-Kolb-Hubbard model, i.e. the Hubbard model with the pair-hopping interaction J is studied. We focus on the properties of the superconducting state with the Cooper-pair center-of-mass momentum q= Q (η-phase). The transition into theη-phase, which is favorized by the repulsive J (J<0) is found to occur only above some critical value |J_c|, dependent on band filling, on-site interaction U and band structure, and the system never exhibits standard BCS-like features. This is in obvious contrast with the properties of the isotropic s-wave state, stabilized by the attractive J and attractive U, which exhibit at T=0 a smooth crossover from the BCS-like limit to that of tightly bound pairs with increasing pairing strength.

Keywords

EN

74.20.-z; 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
• 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: 2004
• Volume: 106
• Issue: 5
• Pages: 709-713

Dates

published

2004-11

received

2004-06-06

Contributors

author

W. Czart

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

author

S. Robaszkiewicz

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

References

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• 5. S. Robaszkiewicz, W.R. Czart, Acta Phys. Pol. B, 32, 3267, 2001
• 6. W.R. Czart, S. Robaszkiewicz, Phys. Rev. B, 64, 104511, 2001
• 7. S. Robaszkiewicz, W.R. Czart, Phys. Status Solidi B, 236, 416, 2003
• 8. W. Czart, S. Robaszkiewicz, in preparation
• 9. M. Mierzejewski, M. Maśka, Phys. Rev. B, 69, 054502, 2004

Identifiers

DOI

10.12693/APhysPolA.106.709