Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 23, Pages 4804-4806Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1762703
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Oxide heterojunctions were fabricated by growing a La0.67Ca0.33MnO3-delta (LCMO) film on a 0.5 wt % Nb-doped SrTiO3 single crystal (STON). By removing the oxygen of LCMO, a junction with a rather small diffusion/breakdown voltage and junction resistance has been obtained. The most striking observation of the present work is the extremely strong magnetic-field effects in this weak junction. A field of Happroximate to1.7 T can cause an increase of similar to1130% of the diffusion/breakdown voltage and a magnetoresistance as high as R(H)/R(0)-1approximate to1100%. It is interesting to note that the magnetoresistance is positive, which indicates a basically different mechanism from the manganite, for which a negative magnetoresistance is observed, and could be a result of the change of magnetic and electronic structures of LCMO with respect to STON under magnetic field. (C) 2004 American Institute of Physics.
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