期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 300, 期 1, 页码 246-249出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2005.10.070
关键词
Hubbard model; saturated ferrornagnetism
The stability of saturated and non-saturated ferromagnetism in the Hubbard model is considered in terms of the Green's functions for the Hubbard's many-electron operators. An analysis of earlier approximations and their shortcomings is performed. Various versions of the self-consistent approximations based on the 1/z-expansion in the X-operator formalism are considered. It is demonstrated that the account of longitudinal fluctuations turns out to be essential for description of the non-saturated state. The corresponding pictures of density of states are obtained, Kondo density-of-states singularities owing to spin-flip processes being analyzed. (c) 2005 Elsevier B.V. All rights reserved.
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