The widths of the valence bands in the copper (I) delafossites CuGaO2, CuInO2, and CuScO2 have been measured by O K-shell x-ray emission spectroscopy and are compared with previous experimental work on CuAlO2 and CuCrO2. In agreement with recent density-functional theory calculations it is found that the bandwidth decreases in the series CuAlO2>CuGaO2>CuInO2>CuScO2. It is shown that states at the top of the valence band are of dominant Cu 3dz2 atomic character but with significant mixing with O 2p states.
|Journal||Physical Review B|
|Publication status||Published - 3 Nov 2009|