Some Properties of the Spin-Polarized Attractive Hubbard Model

• Authors: A. Kujawa , R. Micnas
• Languages of publication: EN

Abstracts

EN

The influence of a Zeeman magnetic field on the superconducting characteristics of the attractive Hubbard model was investigated. The ground state and temperature phase diagrams were obtained for a fixed number of particles. Two critical magnetic fields were found for the first order phase transition from the superconducting to the normal state for n ≠ 1. For some range of parameters a reentrant transition was found and gapless superconductivity was obtained. The significance of the Hartree term was also analyzed.

Keywords

EN

71.10.Fd; 74.20.Rp; 71.27.+a; 71.10.Hf

Discipline

• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 71.10.Fd: Lattice fermion models (Hubbard model, etc.)
• 71.10.Hf: Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems
• 74.20.Rp: Pairing symmetries (other than s-wave)

• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 1
• Pages: 138-140

Dates

published

2009-01

Contributors

author

A. Kujawa

• Solid State Theory Division, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

author

R. Micnas

• Solid State Theory Division, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland

References

• 1. A.M. Clogston, Phys. Rev. Lett. 9, 266 (1962)
• 2. G. Sarma, J. Phys. Chem. Solids 24, 1029 (1963)
• 3. P. Fulde, R.A. Ferrell, Phys. Rev. 135, A550 (1964)
• 4. A.I. Larkin, Y.N. Ovchinnikov, Zh. Eksp. Teor. Fiz. 47, 1136 (1964)
• 5. L.W. Gruenberg, L. Gunther, Phys. Rev. Lett. 16, 996 (1966)
• 6. D.E. Sheehy, L. Radzihovsky, Phys. Rev. Lett. 96, 060401 (2006)
• 7. K.B. Gubbels, M.W.J. Romans, H.T.C. Stoof, Phys. Rev. Lett. 97, 210402 (2006)
• 8. Ch. Chien, Q. Chen, Y. He, K. Levin, Phys. Rev. Lett. 98, 110404 (2007)
• 9. M.M. Parish, F.M. Marchetti, A. Lamacraft, B.D. Simons, Phys. Rev. Lett. 98, 160402 (2007)
• 10. T.K. Koponen, T. Paananen, J.P. Martikainen, P. Törmä, Phys. Rev. Lett. 99 120403, (2007)
• 11. Y. Shin, C.H. Schunck, A. Schirotzek, W. Ketterle, Nature 451, 689 (2008)
• 12. R. Micnas, J. Ranninger, S. Robaszkiewicz, Rev. Mod. Phys. 62, 113 (1990)
• 13. A. Kujawa, R. Micnas, Acta Phys. Pol. A 114, 43 (2008)
• 14. A. Kujawa, R. Micnas, in preparation

Identifiers

DOI

10.12693/APhysPolA.115.138