Electronic structure of the Zr suboxide layer formed on a ZrC( 100 ) surface

Angle-resolved and resonant photoemission study of the ZrO-like film on ZrC(1 0 0)

“…2 shows off-normal-emission spectra of the surface covered by the ZrO-like film taken at various detection angles along the h1 0 0i ðC MÞ direction. The O 2p bands are observed at 6-8 eV, and the band structure of the O 2p bands has been discussed in detail in a previous paper [12]. The peaks induced by the formation of the ZrO-like film are also observed at 0-1 eV, and the intensities of these peaks are found to be intensified around the M point (h d = 16-28°).…”

“…4 shows that the intensities of the a 1 and a 2 peaks show the hm-dependences much different from each other. The a 1 and a 2 peaks are induced by the formation of the ZrO-like film and the ZrO-like film has been proved to have two-dimensional electronic states [12], and thus the hm-dependence of each peak is not induced by the dispersion of the initial state along the axis normal to the surface. We measured the hm-dependent spectra of the clean surface around the M point (not shown) and proved that no peak exist around E F at hm = 35-80 eV, and thus the hm-dependence of each peak should include little contribution of the dispersion effect of the ZrC bulk bands.…”

“…In a previous ARPES study on the ZrO-like film on ZrC(100), the two-dimensional band structure of the O 2p states was measured and the results showed that the states have dispersions with the (1 · 1) periodicity [12]. In this study, the initial states of the a 1 and a 2 peaks are found to have dispersions nearly symmetric with respect to the M point, which is also compatible with the (1 · 1) periodicity of the film.…”

“…The activation of the surface should be closely related to the modification of the surface electronic structure, and thus it is important to elucidate the electronic structure of the ZrO-like film. The electronic structure of the ZrO-like film on ZrC(100) has been investigated by angle-resolved photoemission spectroscopy (ARPES) [12]. The study showed that, in addition to the O 2p band at 6-8 eV, bands exist around the Fermi level (E F ) in the ZrO-like film [12].…”

“…The electronic structure of the ZrO-like film on ZrC(100) has been investigated by angle-resolved photoemission spectroscopy (ARPES) [12]. The study showed that, in addition to the O 2p band at 6-8 eV, bands exist around the Fermi level (E F ) in the ZrO-like film [12]. The ARPES measurements showed that the bands around E F have clear dispersions, meaning that the bands are not induced from O vacancies and should be ascribed to the state inherent to the stoichiometric ZrO-like film.…”