ANGLE-RESOLVED PHOTOEMISSION INVESTIGATION OF THE VALENCE BANDS OF RUCL3

The electronic structure of the layered compound RuCl3 is studied by m eans of X-ray photoelectron spectroscopy and angle-resolved ultraviole t photoelectron spectroscopy. The energy distribution curves are measu red along different azimuthal directions Gamma M, Gamma M', and Gamma K in the Brillouin zone. The experimental valence bands of RuCl3 consi sting of an uppermost non-dispersive band of d symmetry at about 2 eV above the top of the valence p band, and two dispersive bands of p sym metry are studied by application of the E(k parallel to) method. The n ature of the valence bands of RuCl3 are discussed in relation to the e lectronic structure of the metal RuO2 owing to their similar X-ray pho toelectron spectra.