Temporal Fluctuations of Moment in Paramagnets by Neutron Diffraction

摘要: The inelastic scattering of neutrons by temporal fluctuations spin in a paramagnet is reviewed. cross section directly proportional to the imaginary part generalized frequency and wavelength‐dependent susceptibility material. For localized spins theory discussed both terms exact solutions for few cases where this known moments susceptibility. Experimentally technique provides good measurements exchange constants at high temperatures insulators rare earth metals magnetic electrons are localized. In transition form modified itinerance reflected experimental data. Exchange correlation effects will enhance low‐frequency component over that predicted noninteracting electron gas. data available appear confirm existence such enhancement effects.