2008/06/20 by Yoshimitsu Kohama, Yoichi Kamihara, Masahiro Hirano +4 · 3 citations
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Crystallography #Doping #Electrical resistivity and conductivity #Ferromagnetism #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Magnetic susceptibility #Materials science #Physics #Quantum mechanics #Rare-earth and actinide compounds #Spin (aerodynamics) #Superconductivity #Thermodynamics #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.78.020512
published as Phys. Rev. B 78, 020512(R) (2008) · 13 pages, 4 figures
arxiv created 2008/06/20 · openalex publication_date 2008/07/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The F-doped LaFeAsO---a recently discovered superconductor with the high Tc of 26 K---has been studied using the resistivity (\ensuremathρ), magnetic-susceptibility (\ensuremathχ), and heat-capacity (Cp) measurements in the F doping range 0\ensuremath≤x\ensuremath≤0.14 (LaFeAsO_1\ensuremath-xFx). In the low-temperature region, a T3 ln T term in Cp and a T2 term in \ensuremathχ---which are derived from the spin fluctuation---are observed. The nearly ferromagnetic nature evidenced by a large Wilson ratio (6.5 for x=0 and 11.2 for x=0.025) suggests that the superconductivity in the LaFeAsO system is mediated by ferromagnetic spin fluctuation.