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Raman scattering from magnons, electronic excitations and phonons in antiferromagnetic FeI2

The Raman spectrum of FeI2 has been measured at temperatures above and below the antiferromagnetic ordering temperature TN=9 K. Spectral features due to Raman scattering from phonons, Fe2+-ion electronic excitations and one and two-magnon excitations are analysed and assigned. An effective-Hamiltonian model in second order is used to describe the Fe2+-ion levels within the 5T2g(5D) ground term, and the effects of antiferromagnetic ordering are included in a mean-field model. A comparison is made between the energy-matrix parameters obtained for the related trigonal compounds FeCl2, FeBr2 and FeI2.