Photoemission determination of the occupiedd-band position for CdCr2Se4and CdCr2S4

Photoemission spectroscopy has been used to investigate the valence band of Cd${\mathrm{Cr}}_2$ ${\mathrm{Se}}_4$ and Cd${\mathrm{Cr}}_2$ ${\mathrm{S}}_4$. The occupied $d$ bands for both materials have been found to lie below the top of the valence band. Comparison is made to recent band-structure calculations, and the implications of this electronic structure for the unusual behavior of the transport properties and absorption edge are discussed.