Temperature dependent electron-phonon coupling in FeCl2observed by Raman scattering

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Abstract
Strong coupling between an electronic transition in the 5T2g(5D) manifold of Fe2+ ions in FeCl2 and the Eg optical phonons in this material has been observed by light scattering. The Raman spectrum is temperature dependent and shows a marked change at the antiferromagnetic ordering temperature. Above TN, the spectrum contains a symmetric band which becomes asymmetric on the high energy shoulder when the temperature is lowered. Just below TN the band comprises two sharp features accompanied by a third broad band. Well below TN the sharp features have coalesced. A simple model is presented which successfully accounts for the observed temperature dependence of the band position, width and structure.