On the origin of magnetoresistance in Sr$_2$FeMoO$_6$

Details On the origin of magnetoresistance in Sr$_2$FeMoO$_6$ On the origin of magnetoresistance in Sr$_2$FeMoO$_6$

2003-11-02

arxiv.org/abs/cond-mat/0311013v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

We report detailed magnetization ($M$) and magnetoresistance ($MR$) studies on a series of Sr$_2$FeMoO$_6$ samples with independent control on anti-site defect and grain boundary densities. These results, exhibiting a switching-like behavior of $MR$ with $M$, establish that the $MR$ is controlled by the magnetic polarization of grain boundary regions, rather than of the grains within a resonant tunnelling mechanism.

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