Abstract
In K2CoF4 and Rb2CoF4 polarized Raman spectra at low temperature in a magnetic field show various features due to magnetic excitons. They are interpreted on the basis of a multilevel propagating exciton model deduced from a Hamiltonian including the single ion spin-orbit coupling, the low symmetry crystal field, and a nearest neighbour Heisenberg exchange interation, acting in the 4Γ+4 (Oh) ground state of Co2+. From the lowest exciton study we derive the values of the tetragonal crystal field Δ and of the isotropic exchange J.
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