Raman Scattering in the Quadrupolar Ordering Phase of CeB₆

Abstract

We theoretically investigate the Raman scattering in the quadrupolar ordering phase of CeB₆, on the basis of the model Hamiltonian of Shiba et al. Approximating the total susceptibility by a sum of quadrupole moments of each Ce atom, we calculate the Raman spectra corresponding to the orbital excitations in the Γ₈ states within the random phase approximation. We obtain the spectra consisting of several peaks as a function of frequency shift. They are found to depend strongly on the polarization of light. We discuss also the temperature and the magnetic field dependences of the spectra.