GROWTH AND STRUCTURE OF SAMARIUM OVERLAYERS ON A COBALT(0001) SINGLE-CRYSTAL

The growth and electronic behaviour of Sm ultra thin films deposited o n a Co(0001) substrate have been studied by Auger spectroscopy, high e nergy electron diffraction and X-ray photoemission experiments. When t he Co substrate is held at room temperature, a quasi two-dimensional g rowth is observed, whereas at higher substrate temperature (610 K), de position of Sm leads to the formation of an epitaxial trivalent Sm-Co compound. At room temperature, Sm 3d photoemission spectra show an imp ortant time dependence.