Electrical transport properties of the interface between a Nd_(0.7)Sr_(0.3)MnO_(3) ceramic and a Ag electrode are investigated using the ac impedance over a wide temperature and frequency ranges.The ac impedance measu...Electrical transport properties of the interface between a Nd_(0.7)Sr_(0.3)MnO_(3) ceramic and a Ag electrode are investigated using the ac impedance over a wide temperature and frequency ranges.The ac impedance measurements give the compressed semicircle arcs at different temperatures,which are used for the analysis of different contributions to electrical transport based on an electrical equivalent circuit.A significant interface-dependent electroresistance effect of 530% is clearly developed around the metal-insulator transition temperature 130K,which is confirmed as the interface-layer dependent Curie temperature by the plot of interfacial conductance with frequency at different temperatures.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 10774040,11174073 and 10911120055/A0402the Program for New Century Excellent Talents in University under Grant No NCET-08-0674the Joint Chinese-Russian Project under Grant No 08-02-92205。
文摘Electrical transport properties of the interface between a Nd_(0.7)Sr_(0.3)MnO_(3) ceramic and a Ag electrode are investigated using the ac impedance over a wide temperature and frequency ranges.The ac impedance measurements give the compressed semicircle arcs at different temperatures,which are used for the analysis of different contributions to electrical transport based on an electrical equivalent circuit.A significant interface-dependent electroresistance effect of 530% is clearly developed around the metal-insulator transition temperature 130K,which is confirmed as the interface-layer dependent Curie temperature by the plot of interfacial conductance with frequency at different temperatures.
