Itinerant versus localized $d$ electrons in ionic metalliclike ferromagnets: ${\mathrm{La}}_{1-x}{\mathrm{Pb}}_x\mathrm{Mn}{\mathrm{O}}_3$

X-ray and uv photoemission, combined with measurements of the electron spin polarization demonstrate the existence of the double-exchange conduction band in the catalyst ${\mathrm{La}}_{1-x}{\mathrm{Pb}}_x\mathrm{Mn}{\mathrm{O}}_3$. In the ferromagnetic metallic state ($T<\mathrm{}{T}_c\cong 340$°K) the occupied delocalized $\mathrm{Mn}\left(e_g\right)$ electrons are found to be located between the Fermi level $E_F$ and 1.5 eV. The more localized $\mathrm{Mn}\left(t_{2g}^3\right)$ levels are centered around 2.5 eV below $E_F$, overlapping with the upper part of the $p$-valence band, which extends up to 2 eV below $E_F$. In order to explain the observed absolute value of the electron spin polarization, futhermore, we have to allow the $\mathrm{Pb}\left(6\mathrm{}s\right)$ states to extend over a wide energy range, starting from a few tenths of an eV from $E_F$. The intraionic correlation energy of $3d$ electrons is shown not to exceed 2-2.5 eV.