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VOLUME 92 (2010) | ISSUE 8 | PAGE 596
Validity of Anderson and Hubbard model for the description of Ce metal and cerium heavy fermion compounds
The importance of taking into account inter-site f-f hybridization in electron structure calculations for Ce metal and cerium heavy fermion compounds was studied. We demonstrate that for heavy-fermion systems such as cerium compound CeCu2Si2 f-f hybridization can be neglected and Anderson model application is well justified. On another hand for cerium metal f-f hybridization is strong enough to provide the contribution to hybridization function comparable to hybridization between 4f and itinerant electrons. We argue that in the case of Ce only the most general Hamiltonian combining Hubbard and Anderson models should be used.