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

被引：19

作者：

Guo, E. J. ^{[1
,2
]}

Wang, L. ^{[1
,2
]}

Wu, Z. P. ^{[1
]}

Wang, L. ^{[1
,2
]}

Lu, H. B. ^{[2
]}

Jin, K. J. ^{[2
]}

Gao, J. ^{[1
]}

机构：

[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[2] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 110卷 / 11期

基金：

中国国家自然科学基金;

关键词：

COLOSSAL MAGNETORESISTANCE; GIANT MAGNETORESISTANCE; THIN-FILMS; LA1-XCAXMNO3; LA1-XCEXMNO3; TRANSPORT; SYSTEMS; LA;

D O I：

10.1063/1.3666056

中图分类号：

O59 [应用物理学];

学科分类号：

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]

引用

页数：7

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