Applicability of Anderson and Hubbard model for Ce metal and cerium heavy fermion compounds

Details Applicability of Anderson and Hubbard model for Ce metal and cerium heavy fermion compounds Applicability of Anderson and Hubbard model for Ce metal and cerium heavy fermion compounds

2010-09-17

arxiv.org/abs/1009.3382v1

JETP Letters 92, 596 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

5 figures

Scientific paper

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 CeCu$_2$Si$_2$ $f-f$ 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.

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