Low temperature electrical properties of magnetite and Mn-ferrites

Z. Simsa; V.A.M. Brabers

doi:10.1109/20.11643

Low temperature electrical properties of magnetite and Mn-ferrites

Z. Simsa, V.A.M. Brabers

Physics of Nanostructures

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Electrical resistivity and thermoelectric power measurements have been made on single crystals of manganese ferrites, MnxFe3-xO4 (x=0, 0.5, 0.7, 0.8, 0.9, and 0.95) in the temperature range 10 K to 300 K. Below the Verwey transition Tv of magnetite, the thermoelectric power is strongly influenced by the oxygen nonstoichiometry of the samples whereas the resistivity exhibits hardly any dependence on the changes of the oxygen content. Starting from the lowest temperatures, the electrical properties are explained in terms of the impurity band, variable range hopping, small polaron band, and small polaron hopping conduction mechanisms where the long-range and the short-range orderings have to be taken into account.

Original language	English
Pages (from-to)	1910-1914
Journal	IEEE Transactions on Magnetics
Volume	24
Issue number	2, Pt. 2
DOIs	https://doi.org/10.1109/20.11643
Publication status	Published - 1988

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abstract = "Electrical resistivity and thermoelectric power measurements have been made on single crystals of manganese ferrites, MnxFe3-xO4 (x=0, 0.5, 0.7, 0.8, 0.9, and 0.95) in the temperature range 10 K to 300 K. Below the Verwey transition Tv of magnetite, the thermoelectric power is strongly influenced by the oxygen nonstoichiometry of the samples whereas the resistivity exhibits hardly any dependence on the changes of the oxygen content. Starting from the lowest temperatures, the electrical properties are explained in terms of the impurity band, variable range hopping, small polaron band, and small polaron hopping conduction mechanisms where the long-range and the short-range orderings have to be taken into account.",

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AB - Electrical resistivity and thermoelectric power measurements have been made on single crystals of manganese ferrites, MnxFe3-xO4 (x=0, 0.5, 0.7, 0.8, 0.9, and 0.95) in the temperature range 10 K to 300 K. Below the Verwey transition Tv of magnetite, the thermoelectric power is strongly influenced by the oxygen nonstoichiometry of the samples whereas the resistivity exhibits hardly any dependence on the changes of the oxygen content. Starting from the lowest temperatures, the electrical properties are explained in terms of the impurity band, variable range hopping, small polaron band, and small polaron hopping conduction mechanisms where the long-range and the short-range orderings have to be taken into account.

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