Observation of paramagnetic lightscattering from EuO,EuS, Eu0.005Sr0.995S and Gd

We report on lightscattering from the thermal spin precession in paramagnets. The effect had for the first time been reported for CrBr₃, by Sandercock [1] but is now also observed in EuO, EuS, highly Sr diluted EuS and in metallic Gd. It is the same kind of phenomenon as usually studied by means of EPR-experiments where the spin precession is excited by means of microwave absorption. The lightscattering experiments senses the thermal motion of the spins. We have studied the effect as a function of decreasing temperature down into the ferrogmagnetic states of the samples.