Ab. Andrews et al., MOMENTUM-DEPENDENT EFFECTS IN 4F PHOTOEMISSION SPECTRA FROM STRONGLY CORRELATED CEBE13, Physical review. B, Condensed matter, 53(6), 1996, pp. 3317-3326
We have studied the mixed-valent compound CeBe13 using a combination o
f high-resolution angle-resolved resonant photoemission and x-ray abso
rption. Based on the angle and temperature dependence of the intensity
of the f(1) peak at the Fermi level, we conclude that the 4f state is
most likely a narrow band with a bandwidth of similar to 50 meV, and
may cross the Fermi level. The temperature dependence of the valence b
and photoemission spectroscopy can be accounted for by conventional th
ermal broadening effects. A mean valence of v similar to 3.04 is extra
cted from M(4,5) absorption spectra which agrees with L(III) edge meas
urements, however the temperature dependence is negligible. A large am
plitude anisotropy is observed in the f(0) peak, as well as about 0.1
eV of dispersion. Residual gas dosing in the submonolayer regime sugge
sts that much of the f(0) intensity is surface related.