Photo-emission studies of AgxTaS2

Abstract

The authors present angle-integrated photo-emission spectra of the Ta 4f levels of pure 2H-TaS₂ and of Ag_xTaS₂, obtained at high resolution using synchrotron radiation, and of the valence-band regions. The data throw light on the band picture of the intercalated samples, and on the extent of the charge transfer from the Ag⁺ intercalant to the host lattice. The samples are shown to be inhomogeneous, with some regions including no Ag⁺ ions while in others the d(z²) conduction band of the TaS₂ host appears to be virtually filled due to charge transfer from the intercalant.