Abstract
Magnetic properties of the FCC type II antiferromagnetic CeSe have been studied by elastic, diffuse critical and inelastic neutron scattering experiments. The diffuse critical scattering above the Neel temperature corresponds to highly anisotropic longitudinal spin fluctuations with a lenslike intensity distribution. The magnetic phase diagram for fields along the (110) direction contains a first-order magnetic phase transition at H=Hcrit(T)<or=5.7(1) T. Broad paramagnetic crystalline-electric-field excitations are observed. The spin-wave dispersion in the magnetically ordered phase exhibits a molecular-field splitting of 1.06(2) meV and an energy gap at 0.34(2) meV.
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