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Cited by 214

The DOI matches its Crossref record; 1 of the 1 references it cites were found in a registry or an index.

Theory of mott transition : Applications to transition metal oxides

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Cyrot, M.·1972·Journal de Physique

Abstract

Résumé. 2014 En utilisant le modèle de Hubbard, nous étudions la transition métal-isolant due aux corrélations entre électrons. Nous ne tenons pas compte des fluctuations de charge mais seulement des fluctuations de spin qui créent sur chaque site un moment magnétique. Cette simplification per-met une analogie avec les alliages binaires. A température nulle, nous obtenons successivement un métal non magnétique, un métal antiferromagnétique et un isolant antiferromagnétique lorsque le rapport U/W croît (U interaction entre électrons, W largeur de la bande). Ceci est dû, en accord avec les idées de Slater, à la partie dépendante du spin du potentiel self consistent. De la même manière qu’il est possible à température nulle d’obtenir une solution antiferromagnétique de plus basse énergie, nous obtenons au-dessus de la température de Néel une solution avec des moments désor-donnés sur chaque site. Pour de grande valeur du rapport U/W le système reste isolant au-dessus de la température de Néel. Pour des valeurs intermédiaires de U/W, la frontière entre métal et isolant paramagnétique montre que la phase isolante est favorisée à hautes températures a cause de l’entrc-pie de désordre. Nous donnons un diagramme de phase schématique pour le modèle de Hubbard et nous discutons l’application de la théorie aux oxydes de métaux de transition. Abstract. 2014 We study the metal-insulator transition due to correlations between electrons using a

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Metadata

Authors
Cyrot, M.
Venue
Journal de Physique
Publisher
EDP Sciences
Published
1972
Volume
33
Issue
1
Pages
125-134
ISSN
0302-0738 (ISSN-L)
OpenAlex
W2124562005
Cited by
214
References
1
FWCI
7.89
Type
journal article
Language
fr
Open access
green

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Cyrot, M. (1972). Theory of mott transition : Applications to transition metal oxides. Journal de Physique. https://doi.org/10.1051/jphys%3A01972003301012500

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