An inverse photo-emission spectrometer of high efficiency was used to measure the k-resolved inverse photo-emission spectra of (001) and to study the unoccupied surface states. The surface states were found to be located at 0.2eV above the Fermi level at the Γ point and exhibited energy dispersion along the Γ-M direction of the surface Brillouin zone. The dispersion of the unoccupied surface states was inconsistent with theoretical calculations. The discrepancy was attributed to the fact the calculation adopted a smaller interlayer spacing between the topmost La layer and the B sub-surface.

Surface States of LaB6(001) Studied by Inverse Photoemission. Morimoto, O., Kunii, S., Harasawa, A., Kakizaki, A.: e-Journal of Surface Science and Nanotechnology, 2005, 3[3], 367-9