The authors discuss the ab initio calculation of hybridization matrix elements, V4f( in ), in the Anderson model, using the local density approximation. Specifically, alpha -Ce, gamma -Ce, CeRu2 and CeCu2Si2 are studied, comparing with experimental valence spectra and static susceptibilities. They find that the calculated mod V4f( in ) mod 2 have to be adjusted by about a factor 3/4 in alpha - and gamma -Ce and by 1/2 in CeRu2 and CeCu2Si2. The theory seems to give a good description of the reduction of the matrix elements in the alpha - gamma transition of Ce. Reasons why CeRu2 is a mixed valence and CeCu2Si2 is a heavy fermion system are discussed.
 

Journal of Magnetism and Magnetic Materials, 76-77 30-4, 1988.