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Increasing Magnetoresistance Using Magnetic-Field-Tunable Interfaces

Authors

  • Andreas Schmehl,

    Corresponding author
    1. Experimentalphysik VI, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, Augsburg D-86135, Germany
    • Experimentalphysik VI, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, Augsburg D-86135, Germany.
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  • Darrell G. Schlom,

    1. Department of Materials Science and Engineering, Cornell University, Ithaca, NY, 14853 – 1501, USA
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  • Jochen Mannhart

    1. Experimentalphysik VI, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, Augsburg D-86135, Germany
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Abstract

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Europium monoxide displays colossal magnetoresistance (CMR) and metal-to-insulator transitions (MIT). Using rare earth doping, its Curie temperature can be increased up to ∼170 K, but at the cost of drastically reduced CMR and MIT ratios. A substantial increase of these ratios in Eu0.99La0.01O can be achieved by interfacing it with niobium. Hereby the interface transparency critically depends on the large Zeeman splitting of the Eu0.99La0.01O conduction band.

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