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Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO3+delta compounds
Wang, X. L.; Li, D.1; Shi, C. X.; Li, B.; Cui, T. Y.; Zhang, Z. D.
Corresponding AuthorLi, D.(dali@imr.ac.cn)
2010-03-01
Source PublicationPHYSICA B-CONDENSED MATTER
ISSN0921-4526
Volume405Issue:5Pages:1362-1368
AbstractRhombohedral LaMnO3+delta powders were successfully synthesized by annealing gel precursors obtained by a polymerized complex method. The average grain size increases with increasing calcination temperature. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves indicate that LaMnO3+delta compounds obtained at 700 and 800 degrees C are ferromagnetic, while both ferromagnetic and antiferromagned c components are present in those calcined at 900 and 1000 degrees C. This is because the concentration of Mn4+ ions drops with increasing calcination temperature. The temperature dependence of the resistivity of LaMnO3+delta Compounds exhibits an insulator-metal transition at about 90 K and also a low-temperature upturn with a resistivity minimum at about 40 K. Upon increasing particle size, the zero-field resistivity of the LaMnO3+delta powders increases due to suppression of the conduction by the insulating antiferromagnetic component. The negative magnetoresistance of a sample pellet prepared at 700 degrees C ranges from - 82% to - 88% in the temperature range of 40-100 K due to suppression of the spin-dependent scattering by an applied field. (C) 2009 Elsevier B.V. All rights reserved.
KeywordPolymerized synthesis Magnetic properties Magnetoresistance
Funding OrganizationNational Natural Science Foundation of China ; National Major Fundamental Research Program of China ; Ministry of Science and Technology, China
DOI10.1016/j.physb.2009.12.001
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[50831006] ; National Natural Science Foundation of China[50701045] ; National Major Fundamental Research Program of China[2010CB934603] ; Ministry of Science and Technology, China
WOS Research AreaPhysics
WOS SubjectPhysics, Condensed Matter
WOS IDWOS:000275010900026
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/103218
Collection中国科学院金属研究所
Corresponding AuthorLi, D.
Affiliation1.Inst Met Sci & Technol, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Wang, X. L.,Li, D.,Shi, C. X.,et al. Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO3+delta compounds[J]. PHYSICA B-CONDENSED MATTER,2010,405(5):1362-1368.
APA Wang, X. L.,Li, D.,Shi, C. X.,Li, B.,Cui, T. Y.,&Zhang, Z. D..(2010).Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO3+delta compounds.PHYSICA B-CONDENSED MATTER,405(5),1362-1368.
MLA Wang, X. L.,et al."Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO3+delta compounds".PHYSICA B-CONDENSED MATTER 405.5(2010):1362-1368.
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