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Unusual colossal positive magnetoresistance of the heterojunction composed of and Nb-doped
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View: Figures


Image of FIG. 1.
FIG. 1.

curves of the LCMO/SNTO junction at different temperatures, measured under the fields of and . The top insets show the temperature dependence of the in-plane resistance of LCMO and the schematic illustration of the heterojunction, respectively. Bottom inset displays as a function of temperature.

Image of FIG. 2.
FIG. 2.

Temperature dependence of at various positive voltages (top panel) and negative voltages (bottom panel).

Image of FIG. 3.
FIG. 3.

Bias voltage dependence of MR at different temperatures. Inset: temperature dependence of MR at various voltages.

Image of FIG. 4.
FIG. 4.

(a) Schematic DOS of the LCMO/SNTO junction. (b) Band diagram for each region, where and denote the energies of valence band and conduction band, respectively. is the Fermi level. For LCMO, and are associated with and , respectively. is the energy of the band that is jointly determined by and . The gray areas mark the states being occupied by electrons.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Unusual colossal positive magnetoresistance of the n-n heterojunction composed of La0.33Ca0.67MnO3 and Nb-doped SrTiO3