2001/01/07 by Kazuhiko Kuroki, Masao Ogata, Ryotaro Arita +1 · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.63.060506
5 pages, RevTeX, to appear in Phys.Rev.B (Rapid Communications)
arxiv created 2001/01/07 · openalex publication_date 2001/01/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The competition between spin-triplet and singlet pairings is studied theoretically for the tight-binding \ensuremathα--\ensuremathβ bands in Sr2RuO4, which arise from two sets of quasi-one-dimensional Fermi surfaces. Using the multiband fluctuation exchange approximation, where we incorporate an anisotropy in the spin fluctuations as suggested from experiments, we show that (i) the triplet can dominate over the singlet (which turns out to be extended s), and (ii) the triplet gap function optimized in the Eliashberg equation has an unusual, very nonsinusoidal form, whose time-reversal-broken combination exhibits a crib-shaped amplitude with dips.