4f Shell of Gd~2+ and Gd~3+ ions in Sn_1-xGd_xTe Resonant photoemission study

摘要

Resonant photoemission spectra of Sn_1-xGd_xTe (x = 0.02 and 0.08) measured for the photon energy range 142 to 151 eV show the valence band density of states distribution and the Gd 4f derived maximum. The energy position of the J = 0 component of the Gd 4f maximum was determined and used as a measure of the Gd 4f shell binding energy. The electrostatic model of core level shifts was used to interpret the difference in the Gd 4f binding energies observed for x = 0.02 and x = 0.08.