Effect of substituting Ru4+ and other tetravalent ions in the B-site of rare earth manganates on the magnetotransport properties and charge-ordering

被引:71
作者
Vanitha, PV
Arulraj, A
Raju, AR
Rao, CNR [1 ]
机构
[1] Jawaharlal Nehru Ctr Adv Sci Res, Chem & Phys Mat Unit, Bangalore 560064, Karnataka, India
[2] Jawaharlal Nehru Ctr Adv Sci Res, CSIR, Ctr Excellence Chem, Bangalore 560064, Karnataka, India
来源
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE C-CHIMIE | 1999年 / 2卷 / 11-13期
关键词
rare earth manganates; colossal magnetoresistivity; charge ordering; ruthenium in manganates;
D O I
10.1016/S1387-1609(00)88571-0
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Substitution of Ti and Zr in the B-site of La0.7Ca0.3MnO3 lowers the T-C and the temperature of insulator-metal transition. Substitution of Ru in the B-site of La0.7Ca0.3MnO3, however, does not alter the T-C or T-IM significantly. More importantly, the effect of substitution of Ti and Zr in the B-site of the charge-ordered Nd0.5Ca0.5MnO3 progressively destroys the charge-ordering in this insulating material. In contrast, substitution by Ru in the B-site renders the material ferromagnetic with the T-C increasing with the Ru content and the material also shows insulator-metal transition. This marked effect of Ru substitution on the charge-ordering is also seen in Nd0.5Sr0.5MnO3 where the T-C increases with Ru content while charge-ordering gets destroyed. The extraordinary effect of Ru in favouring the ferromagnetic metallic state and destroying the charge-ordering is attributed mainly to its unique electronic configuration (t(2g)(4)e(g)(0)). (C) 1999 Academie des sciences / Editions scientifiques et medicales Elsevier SAS.
引用
收藏
页码:595 / 601
页数:7
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