Effect of thermal-annealing on the magnetoresistance of manganite-based junctions
Xie Yan-Wu(谢燕武)a)b)†, Shen Bao-Gen (沈保根)b), and Sun Ji-Rong(孙继荣)b)
aState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China; bState Key Laboratory for Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Abstract Thermal-annealing has been widely used in modulating the oxygen content of manganites. In this work, we have studied the effect of annealing on the transport properties and magnetoresistance of junctions composed of a La0.9Ca0.1MnO3 + $\delta$ film and a Nb-doped SrTiO3 substrate. We have demonstrated that the magnetoresistance of junctions is strongly dependent on the annealing conditions: From the junction annealed-in-air to the junction annealed-in-vacuum, the magnetoresistance near 0-V bias can vary from $\sim$ --60% to $\sim$ 0. A possible mechanism accounting for this phenomenon is discussed.
Received: 04 December 2007
Revised: 08 January 2008
Accepted manuscript online:
(Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization)
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10474133 and
10674169) and the National Fundamental Research of China (Grant No
2007CB925002).
Cite this article:
Xie Yan-Wu(谢燕武), Shen Bao-Gen (沈保根), and Sun Ji-Rong(孙继荣) Effect of thermal-annealing on the magnetoresistance of manganite-based junctions 2008 Chin. Phys. B 17 2272
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