Photoemission and inverse photoemission studies of CeSn3 and LaSn3

Angle-resolved photoemission spectra (ARPES) and angle-resolved inverse photoemission spectra from single crystals of CeSn[subscript]3 (111) and LaSn[subscript]3 (111) were measured and discussed. The results were compared with the calculated band structures and fitted by the Gunnarsson-Schonhammer (G-S) model. The two-peak structure from the resonance photoemission of CeSn[subscript]3 was fitted by G-S model well by placing the single f-level at 2.0 eV below the Fermi energy before hybridization. ARPES from both CeSn[subscript]3 and LaSn[subscript]3 showed a peak near the Fermi energy without noticeable dispersion. In LaSn[subscript]3, the experimental E([vector] k) points below 1.5 eV binding energy from the band mapping agreed well with the calculated band structure;In inverse photoemission, the spectra of both CeSn[subscript]3 and LaSn[subscript]3 were totally different from the BIS spectra and gave poor agreement with the band calculations. The results suggested that there were atomic-like 4f states near the Fermi Oil, Gas, and Energy;The surface stoichiometry for CeSn[subscript]3 was measured by AES and the structure was investigated by LEED. The stoichiometry of the CeSn[subscript]3 (111) surface was close to that of the bulk, and 3-fold-symmetric LEED patterns from both CeSn[subscript]3 and LaSn[subscript]3 were observed.</p

Inverse-photoemission measurement of iron oxides on polycrystalline Fe

We measured the inverse-photoemission spectra (IPES) of iron oxides grown on an Fe substrate and calculated the band structure of paramagnetic FeO to analyze the IPES. The band-structure calculation showed some overlap between Fe 3d states and O 2p states in the region of occupied states, and s,p-like states of Fe in the unoccupied region. Isochromatic IPES showed two structures at ∼2.5 and ∼7.5 eV above the Fermi energy. We estimated from the IPES data a full band gap of 2.5 eV for FeO.This article is from Physical Review B 41 (1990): 12227, doi:10.1103/PhysRevB.41.12227. Posted with permission.</p

Angle-resolved inverse photoemission from the Ag(100) surface

Angle-resolved inverse-photoemission spectra from Ag(100) have been measured. The results are compared with the predictions of bulk band-structure theory and a free-electron model. The latter gives good agreement for the structure with a final state near the Fermi energy. Band theory is needed for the structure 17 eV above the Fermi energy. This structure is very nondispersive, indicating the existence of a very flat band throughout the ΓXUL plane.This article is from Physical Review B 40 (1989): 10238, doi:10.1103/PhysRevB.40.10238. Posted with permission.</p