Some Properties of the Spin-Polarized Attractive Hubbard Model |
| A. Kujawa and R. Micnas
Solid State Theory Division, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
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| 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. |
| DOI: 10.12693/APhysPolA.115.138 PACS numbers: 71.10.Fd, 74.20.Rp, 71.27.+a, 71.10.Hf |