Itinerant electron ferromagnetism in narrow energy bands

M. I. Auslender; V. Y.U. Irkhin; M. I. Katsnelson

doi:10.1088/0022-3719/21/32/007

Itinerant electron ferromagnetism in narrow energy bands

M. I. Auslender, V. Y.U. Irkhin, M. I. Katsnelson

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27 Scopus citations

Abstract

It is demonstrated that the usual perturbation approach is not applicable when considering systems with strong inter-electron correlations (with Hubbard sub-bands). In particular, the expansion in the electron occupation numbers in the low-density limit yields contributions to the ground-state energy which diverge at U to infinity, with U being the Hubbard intra-site repulsion. The dynamic magnetic susceptibility in the Hubbard model with U to infinity is calculated self-consistently using many-electron Hubbard operators. The saturation magnetisation, spin-wave spectrum, Curie temperature and the paramagnetic susceptibility containing the Curie-Weiss contribution are obtained. The results are used to interpret the properties of the system Fe_1-xCo_xS₂. The method developed is generalised in order to consider the narrow-band s-d exchange model.

Original language	English
Pages (from-to)	5521-5537
Number of pages	17
Journal	Journal of Physics C: Solid State Physics
Volume	21
Issue number	32
DOIs	https://doi.org/10.1088/0022-3719/21/32/007
State	Published - 20 Nov 1988
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
General Engineering
General Physics and Astronomy

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title = "Itinerant electron ferromagnetism in narrow energy bands",

abstract = "It is demonstrated that the usual perturbation approach is not applicable when considering systems with strong inter-electron correlations (with Hubbard sub-bands). In particular, the expansion in the electron occupation numbers in the low-density limit yields contributions to the ground-state energy which diverge at U to infinity, with U being the Hubbard intra-site repulsion. The dynamic magnetic susceptibility in the Hubbard model with U to infinity is calculated self-consistently using many-electron Hubbard operators. The saturation magnetisation, spin-wave spectrum, Curie temperature and the paramagnetic susceptibility containing the Curie-Weiss contribution are obtained. The results are used to interpret the properties of the system Fe1-xCoxS2. The method developed is generalised in order to consider the narrow-band s-d exchange model.",

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T1 - Itinerant electron ferromagnetism in narrow energy bands

AU - Auslender, M. I.

AU - Irkhin, V. Y.U.

AU - Katsnelson, M. I.

PY - 1988/11/20

Y1 - 1988/11/20

N2 - It is demonstrated that the usual perturbation approach is not applicable when considering systems with strong inter-electron correlations (with Hubbard sub-bands). In particular, the expansion in the electron occupation numbers in the low-density limit yields contributions to the ground-state energy which diverge at U to infinity, with U being the Hubbard intra-site repulsion. The dynamic magnetic susceptibility in the Hubbard model with U to infinity is calculated self-consistently using many-electron Hubbard operators. The saturation magnetisation, spin-wave spectrum, Curie temperature and the paramagnetic susceptibility containing the Curie-Weiss contribution are obtained. The results are used to interpret the properties of the system Fe1-xCoxS2. The method developed is generalised in order to consider the narrow-band s-d exchange model.

AB - It is demonstrated that the usual perturbation approach is not applicable when considering systems with strong inter-electron correlations (with Hubbard sub-bands). In particular, the expansion in the electron occupation numbers in the low-density limit yields contributions to the ground-state energy which diverge at U to infinity, with U being the Hubbard intra-site repulsion. The dynamic magnetic susceptibility in the Hubbard model with U to infinity is calculated self-consistently using many-electron Hubbard operators. The saturation magnetisation, spin-wave spectrum, Curie temperature and the paramagnetic susceptibility containing the Curie-Weiss contribution are obtained. The results are used to interpret the properties of the system Fe1-xCoxS2. The method developed is generalised in order to consider the narrow-band s-d exchange model.

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Itinerant electron ferromagnetism in narrow energy bands

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