Possible high-Tcsuperconductivity mediated by antiferromagnetic spin fluctuations in systems with Fermi surface pockets

2001/01/29 by Kazuhiko Kuroki, Ryotaro Arita · 4 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.64.024501

5 pages, uses RevTeX

arxiv created 2001/01/29 · openalex publication_date 2001/06/07 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We propose that if there are two small pocketlike Fermi surfaces, and the spin susceptibility is pronounced around a wave vector Q that bridges the two pockets, the spin-singlet superconductivity mediated by spin fluctuations may have a high transition temperature. Using the fluctuation exchange approximation, this idea is confirmed for the Hubbard on a lattice with alternating hopping integrals, for which T_c is estimated to be almost an order of magnitude larger than those for systems with a large connected Fermi surface.

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