摘要
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.
作者
陈顺生
杨昌平
罗晓靖
Barner K.
Medvedeva I.V.
CHEN Shun-Sheng;YANG Chang-Ping;LUO Xiao-Jing;Barner K.;Medvedeva I.V.(Faculty of Physics and Electronic Technology,Hubei University,Wuhan 430062;Faculty of Mathematics and Physics,Huangshi Institute of Technology,Huangshi 435003;Department of Physics,University of Göttingen,Tammanstrasse 1-37077 Göttingen,Germany;Institute of Metal Physics,Ural Division of the Russian Academy of Sciences,Ekaterinburg 620219,Russia;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 10774040,11174073 and 10911120055/A0402
the Program for New Century Excellent Talents in University under Grant No NCET-08-0674
the Joint Chinese-Russian Project under Grant No 08-02-92205。
