2008/07/28 by Ar. Abanov, Andrey V. Chubukov, A. V. Chubukov +1
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 #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.78.220507
published as Phys. Rev. B 78, 220507(R) (2008) · 5 pages, 4 figures
arxiv created 2008/07/28 · openalex publication_date 2008/12/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
We consider the evolution of d_x2\ensuremath-y2 pairing, mediated by nearly critical spin fluctuations, with the coupling strength. We show that the onset temperature for pairing, T^\ensuremath∗, smoothly evolves between weak and strong couplings passing through a broad maximum at intermediate coupling. At strong coupling, T^\ensuremath∗ is of order of the magnetic exchange energy J. We argue that for all couplings, pairing is confined to the vicinity of the Fermi surface. We also find that thermal spin fluctuations only modestly reduce T^\ensuremath∗, even at criticality, but they substantially smooth the gap anisotropy. The latter evolves with coupling being the largest at weak coupling.