Phys. Rev. B 72, 024453 (2005) [5 pages]Grain-boundary magnetoconductance and inelastic tunnelingReceived 7 February 2005; published 25 July 2005 Measurements of the magnetoconductance of La0.7Sr0.3MnO3 pressed powder samples in both the low and high field regime are reported. The magnetoconductance was calculated in a model based on inelastic tunneling via Mn sites situated in the tunneling barrier. This model satisfactorily accounts for the strong decrease of the low field magnetoconductance as a function of temperature due to spin depolarization in the inelastic tunneling processes. The susceptibility of the tunneling barrier was derived by two different methods showing the consistency of the model. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.024453
DOI:
10.1103/PhysRevB.72.024453
PACS:
75.47.Gk, 75.70.−i, 73.50.Jt
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