Dynamical Susceptibility in Ferromagnetic Metal of CoS2 - Inelastic Magnetic Neutron Scattering -

Article abstract of DOI:10.1143/JPSJ.66.818

Inelastic neutron scattering experiments from a ferromagnetic metal of CoS₂ have been performed in a wide (q, ω) space and a wide temperature range across the Curie temperature, T_C. Magnetic excitations in a small q region are well characterized to be spin-waves below T_C. The sharp response of the spin-wave scattering suddenly broadens at q > 0.27 A^-1 and ω > 8 meV. The paramagnetic fluctuations above T_C are centered at ω = 0 meV, which could be analyzed by a double Lorentzian form in q and ω. The line width Γ satisfies the dynamical scaling hypothesis; Γ = A₀q^2.5f(κ₁/q). The dynamical feature in both below and above T_C indicates that CoS₂ is regarded as a typical itinerant ferromagnet.