Clockwise vs Counter-Clockwise I-V Hysteresis of Point-Contact Metal-Tip/Pr0.7 Ca0.3MnO3/Pt Devices |
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Authors: | GANG Jian-Lei LI Song-Lin LIAO Zhao-Liang MENG Yang LIANG Xue-Jin CHEN Dong-Min |
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Institution: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190Signal and Communication Research Institute, China Academy of RailwaySciences, Beijing 100081 |
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Abstract: | 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. |
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Keywords: | 73 40 73" target="_blank">Rw')">73 40 Rw 73" target="_blank">')"> 73 40 Ns |
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