Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-09-08
Acta Physica Polonica A, Vol. 115 (2009), No. 1, 138-140
Physics
Condensed Matter
Strongly Correlated Electrons
Minor changes. 5 pages, 2 figures, presented at The European Conference Physics of Magnetism 2008, June 24-27, Poznan, Poland
Scientific paper
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 $n\neq 1$. For some range of parameters a reentrant transition was found and gapless superconductivity was obtained. The significance of the Hartree term was also analyzed.
Kujawa Agnieszka
Micnas Roman
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