Systematic Analysis of ARPES Spectra of Transition-Metal Oxides: Nature of Effective d Band

We have performed a systematic tight-binding analysis of the angle-resolved photoemission spectroscopy (ARPES) spectra of a series of transition-metal (TM) oxides A(TM)O-3 and compared the obtained electronic structure parameters with those well established values obtained from cluster-model analyses of photoemission spectra. The values of epsilon(d) - epsilon(p) from ARPES are found to be much larger than the values which would be expected for the limit of weak p-d hybridization, indicating that the effective TM 3d hands are originated from the strong hybridization with the O 2p bands even for light TM oxides.