Phase diagram and spin-glass phenomena in electron-doped La1-xHfxMnO3 (0.05 <= x <= 0.3) manganite oxides

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	Phase diagram and spin-glass phenomena in electron-doped La1-xHfxMnO3 (0.05 <= x <= 0.3) manganite oxides
	Guo, EJ ; Wang, L ; Wu, ZP ; Wang, L ; Lu, HB ; Jin, KJ ; Gao, J
刊名	JOURNAL OF APPLIED PHYSICS
	2011
卷号	110 期号:11
关键词	COLOSSAL MAGNETORESISTANCE GIANT MAGNETORESISTANCE THIN-FILMS LA1-XCAXMNO3 LA1-XCEXMNO3 TRANSPORT SYSTEMS LA
ISSN号	0021-8979
通讯作者	Gao, J (reprint author), Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China.
中文摘要	The effects of tetravalent hafnium doping on the structural, transport, and magnetic properties of polycrystalline La1-xHfxMnO3 (LHMO) (0.05 <= x <= 0.3) were investigated systematically. LHMO exhibited a typical colossal magnetoresistance effect via the double-exchange between Mn2+ and Mn3+ ions, instead of that between Mn3+ and Mn4+ ions in hole-doped manganites. A phase diagram was obtained for the first time through magnetization and resistance measurements in a broad temperature range. As the Hf concentration varied from x = 0.05 to 0.3, the Curie point and metal-to-insulator transition temperature increased significantly, whereas the magnetization and resistivity decreased remarkably. An abnormal enhancement of the magnetization was observed at about 42 K. It was further confirmed that a second magnetic phase MnO2 in LHMO gives rise to such a phenomenon. The possible causes are discussed in detail. The dynamic magnetic properties of LHMO, including relaxation and aging processes, were studied, demonstrating a spin-glass state at low temperature accompanied by a ferromagnetic phase. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3666056]
收录类别	SCI
资助信息	Research Grant Council of Hong Kong [HKU702409P]; URC of the University of Hong Kong; National Natural Science Foundation of China; National Basic Research Program of China
语种	英语
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/50721]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Guo, EJ,Wang, L,Wu, ZP,et al. Phase diagram and spin-glass phenomena in electron-doped La1-xHfxMnO3 (0.05 <= x <= 0.3) manganite oxides[J]. JOURNAL OF APPLIED PHYSICS,2011,110(11).
APA	Guo, EJ.,Wang, L.,Wu, ZP.,Wang, L.,Lu, HB.,...&Gao, J.(2011).Phase diagram and spin-glass phenomena in electron-doped La1-xHfxMnO3 (0.05 <= x <= 0.3) manganite oxides.JOURNAL OF APPLIED PHYSICS,110(11).
MLA	Guo, EJ,et al."Phase diagram and spin-glass phenomena in electron-doped La1-xHfxMnO3 (0.05 <= x <= 0.3) manganite oxides".JOURNAL OF APPLIED PHYSICS 110.11(2011).