Vanitha, P. V. ; Arulraj, Anthony ; Raju, A. R. ; Rao, C. N. R. (1999) Effect of substituting Ru4+ and other tetravalent ions in the B-site of rare earth manganates on the magneto-transport properties and charge-ordering Comptes Rendus de l'Academie des Sciences - Series IIC: Chemistry, 2 (11-13). pp. 595-601. ISSN 1387-1609
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S13871...
Related URL: http://dx.doi.org/10.1016/S1387-1609(00)88571-0
Abstract
Substitution of Ti and Zr in the B-site of La0.7Ca0.3MnO3 lowers the TC and the temperature of insulator-metal transition. Substitution of Ru in the B-site of La0.7Ca0.3MnO3, however, does not alter the TC or TIM 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 TC 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 TC 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 (t2g4eg0).
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Rare Earth Manganates; Colossal Magnetoresistivity; Charge Ordering; Ruthenium in Manganates |
| ID Code: | 42381 |
| Deposited On: | 02 Jun 2011 12:47 |
| Last Modified: | 02 Jun 2011 12:47 |
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