Current-induced asymmetric I-V behavior of La0.82Ca0.18MnO3 thin films and its tunability
Current-induced asymmetric I-V behavior of La0.82Ca0.18MnO3 thin films and its tunability
复制标题
DOI：
10.1063/1.2716307
复制
发表时间：
2007-03
影响因子：
4
通讯作者：
Yuekui Sun;Y. Zhao;C. Xiong
中科院分区：
文献类型：
--
作者：
Yuekui Sun;Y. Zhao;C. Xiong
研究了大电流作用下La_（0.82）Ca_（0.18）MnO_3（LCMO）薄膜的非对称I-V特性。通过消除LCMO/电极界面的贡献，证明了LCMO对非对称I-V行为的贡献。LCMO的非对称I-V特性可以通过在两个电阻态之间施加负电压脉冲和正电流来调节。提出了一个基于局域氧在LCMO晶界的电迁移的能带弯曲模型来解释这一结果。这对理解电流对锰氧化物的作用机理及其应用具有一定的指导意义。
Asymmetric I-V behaviors induced by large currents in La0.82Ca0.18MnO3 (LCMO) films are studied. The contribution of LCMO to the asymmetric I-V behaviors is demonstrated by eliminating the contribution of the LCMO/electrode interface. The asymmetric I-V behaviors of LCMO can be tuned by the negative voltage pulse and positive current excitations between two resistive states. A band bending model based on the local oxygen electromigration at the grain boundaries of LCMO is proposed to account for the results. This work is helpful for understanding the mechanism of the current effect on manganites and also its applications.