2003/04/10 by A. A. Katanin, A. P. Kampf · 2 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Physics of Superconductivity and Magnetism #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.68.195101
published as Phys. Rev. B 68, 195101 (2003) · 29 pages, 17 figures
arxiv created 2003/04/10 · openalex publication_date 2003/11/03 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Phase diagrams of the two-dimensional one-band t\ensuremath-t^\ensuremath' Hubbard model are obtained within the two-patch and temperature-cutoff many-patch renormalization group approaches. At small t^\ensuremath' and at van Hove band fillings antiferromagnetism dominates, while with increasing t^\ensuremath' or changing filling antiferromagnetism is replaced by d-wave superconductivity. Near t^\ensuremath'=t/2 and close to van Hove band fillings the system is unstable towards ferromagnetism. Away from van Hove band fillings this ferromagnetic instability is replaced by a region with dominating triplet p-wave superconducting correlations. The results of the renormalization-group approach are compared with the mean-field results and the results of the T-matrix approximation.