Abstract
The perturbation approach for the real spinS=7/2 has been used to study the conduction band density of states for europium chalcogenides starting from the exact atomic limit Green functions. The density of states for an empty conduction band shows the multi-band structure and is temperature dependent. The shift of the optical absorption edge (rs) as a function of temperature has been obtained for EuO and EuS. The results agree relatively well with experiments on EuO. It is shown that thes-f coupling constant is universal for EuO, EuS and EuSe (ferromagnetic phase).
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