Electronic structure of TiSe2 and TiSe2 intercalated with Eu

We report on a PE study of the electronic structure of pristine TiSe2. The experimental data are compared with results of band-structure calculations. It is confirmed that TiSe2 reveals semimetallic properties. For the first time rare-earth metals were attempted to be incorporated in situ into TiSe2 . It is found that divalent Eu can be easy intercalated, whereas deposition of trivalent Gd leads to strong interfacial reactions. The electronic stru cture of the Eu-intercalation compound cannot be simply described within a rigid-band approach assuming charge transfer from Eu to unoccupied Ti d sta res. In a more elaborated approach hybridization phenomena have to be taken into consideration.