Nian Y B, Strozier J, Wu N J, Chen X, Ignatiev A
Center for Advanced Materials, University of Houston, Houston, Texas, 77204-5004, USA.
Phys Rev Lett. 2007 Apr 6;98(14):146403. doi: 10.1103/PhysRevLett.98.146403. Epub 2007 Apr 4.
Electric-pulse induced resistance hysteresis switching loops for Pr0.7Ca0.3MnO3 perovskite oxide films were found to exhibit an additional sharp "shuttle tail" peak around the negative pulse maximum for films deposited in an oxygen-deficient ambient. The resistance relaxation in time of this "shuttle tail" peak as well as resistance relaxation in the transition regions of the resistance hysteresis loop show evidence of oxygen diffusion under electric pulsing, and support a proposed oxygen diffusion model with oxygen vacancy pileup at the metal electrode interface region as the active process for the nonvolatile resistance switching effect in transition-metal oxides.
研究发现，对于在缺氧环境中沉积的Pr0.7Ca0.3MnO3钙钛矿氧化物薄膜，电脉冲诱导的电阻滞后开关回线在负脉冲最大值附近呈现出一个额外的尖锐“穿梭尾”峰。该“穿梭尾”峰的电阻随时间的弛豫以及电阻滞后回线过渡区域的电阻弛豫，均显示出电脉冲作用下氧扩散的迹象，并支持所提出的氧扩散模型，即在金属电极界面区域存在氧空位堆积，这是过渡金属氧化物中非易失性电阻开关效应的活性过程。
