Spin polarized tunneling in the half-metallic ferromagnet La0.7Sr0.3MnO3: experiment and theory

Details Spin polarized tunneling in the half-metallic ferromagnet La0.7Sr0.3MnO3: experiment and theory Spin polarized tunneling in the half-metallic ferromagnet La0.7Sr0.3MnO3: experiment and theory

1998-07-06

arxiv.org/abs/cond-mat/9807084v1

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages+5 figures (postscript) Communicated to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.59.13919

The magnetoresistance (MR) in polycrystalline colossal magnetoresistive compounds follows a behavior different from single crystals below the ferromagnetic transition temperature. This difference is usually attributed to spin polarized tunneling at the grain boundaries of the polycrystalline sample. Here we derive a theoretical expression for the contribution of spin polarized tunneling to the magnetoresistance in granular ferromagnetic systems under the mean field approximation. We apply this model to our experimental data on the half metallic ferromagnet La0.7Sr0.3MnO3, and find that the theoretical predictions agree quite well with the observed dependence of the spin polarized MR on the spontaneous magnetization.

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