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Reviews of topical problems


Electronic processes in magnetite (or, ’Enigmas of magnetite’)


Lomonosov Moscow State University, Faculty of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation

The properties of magnetite in the region of the low-temperature transformation Tt = 100 – 120 K are in many respects still unclear and even enigmatic, in spite of the enormous number of studies that have been undertaken over the years. In this review article a new model for the low-temperature transformation in magnetite is presented, based on an examination of the features of the temperature and field dependence of the spontaneous magnetization, magnetoresistance, and magnetocaloric effect and an analysis of the anomalies of electronic origin in the magnetic anisotropy and magnetostriction and the accompanying anomalies in the technical magnetization characteristics in the Tt region. This "magnetic-electronic" model of the transition is consistent with experimental facts that do not fit into the well-known Verwey model of a "structural-electronic" transition.

Fulltext pdf (622 KB)
Fulltext is also available at DOI: 10.1070/PU1993v036n05ABEH002160
PACS: 75.47.Lx, 75.30.Sg, 75.60.Ej, 75.80.+q, 75.30.Gw (all)
DOI: 10.1070/PU1993v036n05ABEH002160
URL: https://ufn.ru/en/articles/1993/5/c/
Citation: Belov K P "Electronic processes in magnetite (or, 'Enigmas of magnetite')" Phys. Usp. 36 (5) 380–391 (1993)
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Оригинал: Белов К П «Электронные процессы в магнетите („Загадки магнетита“)» УФН 163 (5) 53–66 (1993); DOI: 10.3367/UFNr.0163.199305c.0053

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