PARAMAGNETIC SCATTERING OF NEUTRONS FROM AN ITINERANT-ELECTRON ANTIFERROMAGNET MN3SI

Magnetic neutron scattering is measured from the itinerant electron an tiferromagnet Mn3Si in the paramagnetic state. The scattering is descr ibed by a Gaussian function in reciprocal lattice space and a Lorentzi an function for the energy dependence. This combination is similar to that of BCC Cr instead of the double Lorentzian form of ordinary magne ts. Spatial correlations at an energy transfer for 5 meV are observed to be 27 Angstrom at 1.7T(N) and 18 Angstrom at 8.7T(N). The temperatu re dependence of the relaxation parameter Gamma is described by (T - T -N)(0.5) up to 8.7T(N).