Anomalous paramagnetic neutron spectra of some intermediate-valence compounds

Magnetic neutron spectra as a function of temperature are presented for the intermediate-valence compounds Ce${\mathrm{Pd}}_3$, Ce${\mathrm{Sn}}_3$, Ce${\mathrm{Be}}_{13}$, Yb${\mathrm{Cu}}_2$ ${\mathrm{Si}}_2$, and TmSe. All compounds show the normal local 4$f$ form factor but a broadened magnetic energy spectrum with an overall width of about 7 to 30 meV and with very little temperature dependence (except TmSe). Closer analysis reveals a residual crystal-field spectrum in Yb${\mathrm{Cu}}_2$ ${\mathrm{Si}}_2$ which may also underlie the spectra of the other compounds. A detailed description of the data analysis is given.