2006/11/28 by Y. L. Loh, Yen Lee Loh, Loh, Y. L. +2
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0611718
9 pages, 8 figures, submitted to Phys. Rev. B
arxiv created 2006/11/28 · openalex publication_date 2006/11/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider an s-wave superconductor in the vicinity of a second-order ferromagnetic (FM) or spin-density-wave (SDW) quantum critical point (QCP), where the superconductivity and magnetism arise from separate mechanisms. The quantum critical spin fluctuations reduce the superconducting Tc. Near a FM QCP, we find that Tc falls to zero as 1/|ln kappa| in 3D and as kappa in 2D, where kappa ~ |J-Jc|nu is the inverse correlation length of the spin fluctuations, and measures the distance |J-Jc| from the quantum critical point. SDW quantum critical fluctuations, on the other hand, suppress Tc to zero as sqrt(kappa) in 2D, and suppress Tc only to a finite value in 3D, producing a cusp of the form (const + |J-Jc|nu).