2003/04/24 by Marcin Mierzejewski, Maciej M. Maska, Maciej M. Maśka · 2 citations
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.69.054502
published as Phys. Rev. B 69, 054502 (2004) · 6 pages, 5 figures, revtex
arxiv created 2003/04/24 · openalex publication_date 2004/02/17 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We analyze the role of Zeeman and orbital pair breaking mechanisms in models which are appropriate for short coherence length superconductors. In particular, we investigate attractive Hubbard and pair hopping models. The orbital pair breaking mechanism dominates in the majority of models with s-wave and d-wave superconducting order parameters. On the other hand, the repulsive pair hopping interaction leads to \ensuremathη type of pairing that is stable against the orbital pair breaking. External magnetic field reduces this type of pairing predominantly due to the Zeeman coupling. According to recent experiments this mechanism is responsible for closing of the pseudogap. Moreover, the temperature dependence of the gap closing field in \ensuremathη phase fits experimental data accurately. We discuss whether the preformed pairs in the \ensuremathη phase could be responsible for the pseudogap phenomenon.