Abstract
The current-voltage characteristics and magnetotransport properties of La0.7Sr0.3MnO3/Nb(1.0%):SrTiO3 junctions under various currents ranging from 10−6 to 10−3 A and different temperatures ranging from 10 to 300 K were investigated. The current-voltage curves exhibit rectifying behavior. The resistance, magnetoresistance, and electroresistance of the junctions are strongly dependent on bias-current direction, current, temperature, and magnetic field. A detailed analysis of the conductance-voltage curves showed that quantum mechanical tunneling was the dominating transport mechanism.
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