Ferromagnetism in the Periodic Anderson Model - a Modified Alloy Analogy

Details Ferromagnetism in the Periodic Anderson Model - a Modified Alloy Analogy Ferromagnetism in the Periodic Anderson Model - a Modified Alloy Analogy

2000-08-30

arxiv.org/abs/cond-mat/0008441v1

Physics

Condensed Matter

Strongly Correlated Electrons

20 pages, 13 figures

Scientific paper

10.1088/0953-8984/12/33/313

We introduce a new aproximation scheme for the periodic Anderson model (PAM). The modified alloy approximation represents an optimum alloy approximation for the strong coupling limit, which can be solved within the CPA-formalism. Zero-temperature and finite-temperature phase diagrams are presented for the PAM in the intermediate-valence regime. The diversity of magnetic properties accessible by variation of the system parameters can be studied by means of quasiparticle densities of states: The conduction band couples either ferro- or antiferromagneticaly to the f-levels. A finite hybridization is a necessary precondition for ferromagnetism. However, too strong hybridization generally suppresses ferromagnetism, but can for certain system parameters also lead to a semi-metallic state with unusual magnetic properties. By comparing with the spectral density approximation, the influence of quasiparticle damping can be examined.

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