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2004 | 106 | 5 | 709-713
Article title

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

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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
Contributors
author
  • Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
  • Institute of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland
References
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  • 2. S. Robaszkiewicz, B. Bul ka, Phys. Rev. B, 59, 6430, 1999 and references therein
  • 3. F. Dolcini, A. Montorsi, Phys. Rev. B, 62, 2315, 2000
  • 4. G.I. Japaridze, A.P. Kampf, M. Sekania, P. Kakashvili, Ph. Brune, Phys. Rev. B, 65, 014518, 2001
  • 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
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv106n521kz
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