Photoemission study of the density of valence states and d-core levels in SnTe

Abstract

High-resolution, high-energy UV and monochromatized Al K alpha X-ray photoemission spectra of the valence bands of SnTe are presented and compared with the results of first-principles relativistic OPW and local and non-local EPM band calculations. Photoemission spectra and the results of band calculations for other FCC structure IV-VI compounds are also briefly discussed and compared to the authors' results. Relativistic OPW calculations are found to give the best overall agreement with experiment. Experimental Sn and Te d-band binding energies and spin-orbit splittings are also given. The Sn d levels are found to be considerably more tightly bound than predicted by OPW band theory, as are the outer d levels of the other IV-VI cations.