Ru-doping-induced ferromagnetism in charge-ordered La(0.4)Ca(0.6)MnO(3)

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	Ru-doping-induced ferromagnetism in charge-ordered La(0.4)Ca(0.6)MnO(3)
	C. L. Lu; X. Chen; S. Dong; K. F. Wang; H. L. Cai; J. M. Liu; D. Li; Z. D. Zhang
	2009
发表期刊	Physical Review B
ISSN	1098-0121
卷号	79 期号:24
摘要	Impurity effects on the stability of a charge-ordered antiferromagnetic state in electron-doped manganite La(0.4)Ca(0.6)MnO(3) are investigated by doping Ru for Mn. Our results show that Ru doping at a tiny level of similar to 2% is sufficient to suppress significantly the charge-ordered insulated state and generate a ferromagnetic metallic one. The blocked metastable state and the first-order metal-insulator transitions observed in the slightly doped samples can be attributed to the phase-separated state where ferromagnetic domains are embedded in the charge-ordered matrix. The doping effect is further investigated theoretically based on the two-orbital model. The calculation suggests that two factors are vitally important for the Ru-doping driven strong ferromagnetic tendency: (1) the ferromagnetic coupling between Ru and Mn spins and (2) the enhancement of e(g) electron density while the topological defects always contribute to the instability of charge-ordered state.
部门归属	[lu, c. l.; chen, x.; dong, s.; wang, k. f.; cai, h. l.; liu, j. -m.] nanjing univ, solid state microstruct lab, nanjing 210093, peoples r china. [lu, c. l.; chen, x.; dong, s.; wang, k. f.; cai, h. l.; liu, j. -m.] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. [li, d.; zhang, z. d.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;liu, jm (reprint author), nanjing univ, solid state microstruct lab, nanjing 210093, peoples r china;liujm@nju.edu.cn
关键词	Antiferromagnetism Calcium Compounds Colossal Magnetoresistance Electron Density Ferromagnetism Lanthanum Compounds Magnetisation Manganese Compounds Metal-insulator Transition Cr-doped Nd1/2ca1/2mno3 Phase-separation Manganites Transition
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32146
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. L. Lu,X. Chen,S. Dong,et al. Ru-doping-induced ferromagnetism in charge-ordered La(0.4)Ca(0.6)MnO(3)[J]. Physical Review B,2009,79(24).
APA	C. L. Lu.,X. Chen.,S. Dong.,K. F. Wang.,H. L. Cai.,...&Z. D. Zhang.(2009).Ru-doping-induced ferromagnetism in charge-ordered La(0.4)Ca(0.6)MnO(3).Physical Review B,79(24).
MLA	C. L. Lu,et al."Ru-doping-induced ferromagnetism in charge-ordered La(0.4)Ca(0.6)MnO(3)".Physical Review B 79.24(2009).