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Electronic Transport and Magnetic Properties in Ferroelectric-Ferromagnetic Composites La5/8Ca3/8MnO3:ErMnO3
Yong-feng Wang,Yun-xin Han,Chang-fei Zhu*
Author NameAffiliationE-mail
Yong-feng Wang CAS Key Laboratory of Energy Conversion Materials, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Yun-xin Han CAS Key Laboratory of Energy Conversion Materials, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Chang-fei Zhu* CAS Key Laboratory of Energy Conversion Materials, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China cfzhu@ustc.edu.cn 
Abstract:
The crystal structures and electronic transport properties of composites, xLa5/8Ca3/8MnO3:ErMnO3:(1-x)ErMnO3(x=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1), where ErMnO3 is the insulating ferroelec-tric and La5/8Ca3/8MnO3 is the metallic ferromagnetic component, were studied. The magnetization of samples (x=0, 0.5, 1) were also measured as a function of temperature from 4 K to 300 K. The X-ray diffraction data show La5/8Ca3/8MnO3 and ErMnO3 are almost complete immiscible, originating from the significant difference in their crystal structures. All the composites show a metal-insulator transition when the molar fraction of xLa5/8Ca3/8MnO3 component x≥0.4 and the electronic transport behaviors follow the classical percolation theory model very well. Magnetization of the mixture with x=0.5 is unique and enhanced greatly compared with that of pure ErMnO3. Comprehensive analysis of the electronic transport and magnetic results suggests that this material system is a new kind of multiferroic with stronger magnetism in a wider temperature range compared with the single phase multiferroic ErMnO3.
Key words:  Multiferroics, Percolation theory model, Interface effect
FundProject:
Electronic Transport and Magnetic Properties in Ferroelectric-Ferromagnetic Composites La5/8Ca3/8MnO3:ErMnO3
王永凤,韩云鑫,朱长飞*
摘要:
系统研究了xLa5/8Ca3/8MnO3:ErMnO3:(1-x)ErMnO3(x=0、0.2、0.4、0.5、0.6、0.8、1)铁电铁磁复合材料的晶体结构和低温下的电磁输运性质.X光衍射结果表明金属铁磁相La5/8Ca3/8MnO3和绝缘铁电相ErMnO3由于晶体结构上的巨大差异几乎完全不相溶.电阻率随x的增大而降低,其导电特性可用经典的渗流理论来解释.当x>xc时,样品电阻特性由La5/8Ca3/8MnO3主导,电阻温度曲线会出现金属绝缘体转变.磁性测试表明,由于xLa5/8Ca3/8MnO3的掺入,复合材料的磁性相比单相ErMnO3得到加强.从电磁性质综合分析认为这种复合材料是一种新的多铁性材料,相比单相多铁性材料ErMnO3,它具有更强的磁性和更广的使用温度范围.
关键词:  多铁性材料,渗流理论模型,界面效应
DOI:10.1088/1674-0068/22/04/406-410
分类号: