Magnetically correlated Schottky barrier in the La1.8Ca1.2Mn2O7 double-layered perovskite ceramic

摘要：

　　Double-layered La1.8Ca1.2Mn2O7 sample with a perovskite structure was synthesized by solid state reaction and electrical transport properties were investigated using 4-wire direct current (DC) and 2-wire altemating current (AC) measurement methods.The result reveals that the Ⅰ-Ⅴ characteristic of the La1.8Ca1.2Mn2O7 ceramic exhibits a linear behaviour above Curie temperature (Tc) while it shows a strong nonlinearity below Tc.The nonlinear coefficient increases with decreasing temperatures and reaches a maximum of 60.5 at 14 K for the limit of the experiment.We believe that a magnetically correlated Schottky barrier forming at the grain boundary is the main factor to control the transport properties for the La1.8Ca1.2Mn2O7 ceramic.

关键词： Double-layered perovskite Schottky barrier Nonlinearity Manganite

作者: Shun-sheng Chen Da-wei Shi Hong-xia Wang Chang-ping Yang Hai-bo Xiao B(a)rner Klaus Medvedeva Vyachslav

作者单位: School of Mathematics and Physics, Hubei Polytechnic University, Huangshi 435003, P.R.China; Faculty Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062, P.R.China Department of Physics, University of G(o)ttingen, Tammanstrasse 1-37077 G(o)ttingen, Germany Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg 620041, R

会议类型: 国际会议

会议名称: The Eighth China National Conference on Functional Materials and Applications(第八届中国功能材料及其应用学术会议)

会议地点: 哈尔滨

会议语种:英文

页码: 744-747

在线出版日期: 2013-08-23（万方平台首次上网日期，不代表论文的发表时间）