The Role of Grain Boundaries in Determining the Transport Properties in Magnetite

Details The Role of Grain Boundaries in Determining the Transport Properties in Magnetite The Role of Grain Boundaries in Determining the Transport Properties in Magnetite

2004-12-14

arxiv.org/abs/cond-mat/0412375v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 figures, Included in the proceedings from the 49th Annual Conference on Magnetism and Magnetic Materials, AIP numbe

Scientific paper

We present magnetoresistance and Hall-effect measurements on single crystal magnetite Fe3O4 close to the Verwey transition Tv = 123.8 K. We show that the formation of grain boundaries accompanying the reduction in crystal symmetry plays a significant role in the electron scattering mechanism, and that grain boundaries can account for the apparent change in sign of the charge carriers below Tv.

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