Valence band of Cd1−xFexSeFe in resonant photoemission spectra

Resonant photoemission spectra of Fe atoms (3p-3d) were measured for freshly cleaved Cd0.86Fe0.14Se crystal (110) surface and for the same surface with sequentially deposited Fe atoms in the range 0.3–80 ML. The synchrotron radiation (LURE, Orsay, France) was used to measure valence band density of state distributions and Cd 4d core level for the radiation energy range 50–60 eV, which includes the Fe 3p-3d resonant energy equal to 56 eV. At the lowest stages of Fe atom deposition (up to about 3 ML), Fe atoms replace Cd atoms in the crystal, making a Cd1−xFexSe alloy with a higher x and leaving extra Cd as small islands or clusters. For the next stages of Fe deposition (about 3–10 ML) the dissociated Cd atoms create a CdFe alloy. At higher stages of Fe deposition (above about 10 ML) a Fe thin film is formed.