Neutron scattering from the ferromagnetic metal CoS2

Inelastic neutron scattering experiments from the ferromagnetic metal CoS2 have been performed in the ferromagnetic as well as paramagentic states. Be low T-C (= 121 K), sharp responses of the spin wave scattering in a small q region suddenly broaden at a boundary of (q(SB),omega(SB)) We speculate th at the damping of spin wave comes from the merging into a Stoner continuum. The paramagnetic diffuse scattering is observed at T-C near the magnetic z one center. We analyzed the data by using a double Lorentzian form in q and omega. The linewidth Gamma satisfies the relation of Gamma proportional to q(2.5). Above T-C, the dynamical scaling hypothesis Gamma = A(0)q(2.5)f(ka ppa(1)/q), explains well the broadening of energy width observed in the par amagnetic diffuse scattering. We discuss how the itinerant character appear s on A(0) and the scaling function. The dynamical feature over the wide tem peratures indicates that CoS2 is regarded as a typical itinerant ferromagne t, even though static measurements classify it, as a nearly saturated narro w band ferromagnet.