Variable f-level width and valence-change transitions in cerium compounds
Kocharyan A. N., Ovnanyan P. S., Khomskii D. I.
A new model explains the abrupt transitions to an intermediate-valence phase in rare-earth compounds on the basis of an increase in the s-/hybridization and an increase in the width of the / level with increasing pressure. In particular, the model explains some recent results on the properties of cerium compounds [J. W. Allen et al., Phys. Rev. Lett. 46, 1100 (1980); M. Croft et a!., Phys. Rev. Lett. 46, 1104(1981)].