Clockwise vs Counter-Clockwise I-V Hysteresis of Point-Contact Metal-Tip/Pr 0.7 Ca 0.3 MnO 3 /Pt Devices
Clockwise vs Counter-Clockwise I-V Hysteresis of Point-Contact Metal-Tip/Pr 0.7 Ca 0.3 MnO 3 /Pt Devices
复制标题
DOI：
10.1088/0256-307x/27/2/027301
复制
发表时间：
2010-02
影响因子：
3.5
通讯作者：
Gang Jian-Lei;Li Songlin;Liao Zhao-liang;Meng Yang;Liang Xuejin;Chen Dong-min
中科院分区：
文献类型：
--
作者：
Gang Jian-Lei;Li Songlin;Liao Zhao-liang;Meng Yang;Liang Xuejin;Chen Dong-min
金属尖端/Pr0.7Ca0.3MnO_3/Pt器件具有两种类型的I-V磁滞：顺时针方向和逆时针方向，具体取决于针尖材料。这两类器件的分类标准可以简单地根据金属针尖的氧化自由能分别低于或高于PCMO。顺时针方向的滞后可以归因于电场诱导的氧化/还原，而逆时针方向的滞后可以用电场中氧空位的迁移来解释。交流电导谱还显示了这两类器件在高阻状态下明显的跳跃势垒。
Metal-tip/Pr0.7Ca0.3MnO3/Pt devices possess two types of I — V hysteresis: clockwise vs counter clockwise depending on the tip materials. The criteria for categorization of these two types of devices can be simply based on whether the Gibbs free energy of oxidation for the metal tip is lower or higher than that of PCMO, respectively. While the clockwise hysteresis can be attributed to electric field induced oxidation/reduction, the counter clockwise hysteresis can be explained by oxygen vacancy migration in an electrical field. Alternating-current conductance spectra also reveal distinct hopping barriers between these two categories of devices at high resistive states.