Influence of nonmagnetic Al ions on magnetoresistance of double-perovskite Sr2Fe1-xAlxMoO6 (0 <= x <= 0.30)

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	Influence of nonmagnetic Al ions on magnetoresistance of double-perovskite Sr2Fe1-xAlxMoO6 (0 <= x <= 0.30)
	Y. Sui; X. J. Wang; J. G. Cheng; Z. G. Liu; J. P. Miao; X. Q. Huang; Z. Lu; Z. N. Qian; W. H. Su; J. K. Tang; C. K. Ong
	2005
发表期刊	Journal of Applied Physics
ISSN	0021-8979
卷号	98 期号:6
摘要	The structural, magnetic, and magnetoresistance properties of the double-perovskite series Sr2Fe1-xAlxMoO6 (0 <= x <= 0.30) were systematically investigated in order to clarify the influence of nonmagnetic Al ions on the magnetoresistance. The structural refinements of these samples show that the degree of cationic order increases gradually from 88.5% for x=0 to 92% for x=0.30 without any change in the crystal structure. The magnetization measurements reveal that the substitution of nonmagnetic Al ion for Fe ion enhances the magnetic moment per Fe ion significantly. In addition, the magnetic-field dependence of magnetization and magnetoresistance of these Sr2Fe1-xAlxMoO6 samples were all fitted excellently by taking into account the contributions from ferromagnetic-coupled Fe-O-Mo region and nonferromagnetic-coupled regions. The fitting results indicate that the low-field magnetoresistance can be greatly enhanced due to the separation of the cationic-ordered Fe-O-Mo regions by the paramagnetic Mo-O-Al-O-Mo chains introduced through Al doping. Furthermore, doping nonmagnetic Al ions also suppress the formation of antiferromagnetic Fe-O-Fe antiphase boundaries, and then lead to the improvement of cation ordering and the reduction of magnetoresistance under high field. (c) 2005 American Institute of Physics.
部门归属	harbin inst technol, dept appl phys, ctr condensed matter sci & technol, harbin 150001, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. univ new orleans, dept phys, new orleans, la 70148 usa. natl univ singapore, ctr superconducting & magnet mat, singapore 117542, singapore. natl univ singapore, dept phys, singapore 117542, singapore.;su, wh (reprint author), harbin inst technol, dept appl phys, ctr condensed matter sci & technol, harbin 150001, peoples r china;suiyu@hit.edu.cn
关键词	Intergrain Tunneling Magnetoresistance Room-temperature Magnetoresistance Low-field Magnetoresistance Sr2femoo6 Double Perovskite Magnetic-properties Fe-site Polycrystals Crystal Oxide
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WOS记录号	WOS:000232226000081
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35038
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Sui,X. J. Wang,J. G. Cheng,et al. Influence of nonmagnetic Al ions on magnetoresistance of double-perovskite Sr2Fe1-xAlxMoO6 (0 <= x <= 0.30)[J]. Journal of Applied Physics,2005,98(6).
APA	Y. Sui.,X. J. Wang.,J. G. Cheng.,Z. G. Liu.,J. P. Miao.,...&C. K. Ong.(2005).Influence of nonmagnetic Al ions on magnetoresistance of double-perovskite Sr2Fe1-xAlxMoO6 (0 <= x <= 0.30).Journal of Applied Physics,98(6).
MLA	Y. Sui,et al."Influence of nonmagnetic Al ions on magnetoresistance of double-perovskite Sr2Fe1-xAlxMoO6 (0 <= x <= 0.30)".Journal of Applied Physics 98.6(2005).