%0 Journal Article
%T The origin of EPIR effect in Nd0.7Sr0.3MnO3 ceramics<br>Nd0.7Sr0.3MnO3陶瓷EPIR效应的起源
%A Yang Chang-Ping
%A Chen Shun-Sheng
%A Dai Qi
%A Song Xue-Ping
%A <br>杨昌平
%A 陈顺生
%A 戴琪
%A 宋学平
%J 物理学报
%D 2011
%I 
%X Polycrystalline ceramic Nd0.7Sr0.3MnO3 is synthesized using high-energy ball milling and post heat treatment method. The properties of electric transport are measured using direct current (DC) 4-wire and 2-wire methods. The results show that both the grain (phase) boundary and the electrode-bulk contact interface has interfacial resistance and space charge layer. The two kinds of space charge regions have greatly different effects on the DC transport: for the former, the I-V curve exhibits nonlinear characteristic and no EPIR effect takes place; for the later, however, an obvious EPIR effect is observed even if the I-V curve also shows nonlinear behaviour. It well suggests that for the ceramic Nd0.7Sr0.3MnO3, only the electrode-bulk contact interface can induce the EPIR effect although there is a similar nonlinear I-V characteristic for the grain (phase) boundary and the electrode-bulk contact interface.
%K EPIR
%K manganite
%K space charge layer
%K nonlinearity<br>电脉冲诱导电阻转变(EPIR)
%K 亚锰酸盐
%K 空间电荷层
%K I-V非线性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=7FB288757ED284A02C558B5B95E66929&yid=9377ED8094509821&vid=BFE7933E5EEA150D&iid=708DD6B15D2464E8&sid=F7B034FDFC8EB045&eid=F7B034FDFC8EB045&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=33