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Magnetism of $Ti^{4+}$ diluted manganites $La_{1-x} Pb_x Mn_{1-y}Ti_yO_3$ $(y\leq x)$

Sahana, M and Dorr, K and Doerr, M and Eckert, D and Muller, KH and Nenkov, K and Schultz, L and Hegde, MS (2000) Magnetism of $Ti^{4+}$ diluted manganites $La_{1-x} Pb_x Mn_{1-y}Ti_yO_3$ $(y\leq x)$. In: Journal of Magnetism and Magnetic Materials, 213 (3). pp. 253-261.

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Abstract

The effect of nonmagnetic $Ti^{4+}$ substitution for $Mn^{4+}$ on magnetic ordering of $La_{1-x}Pb_x Mn_{1-y} Ti_y O_3$ $(x=0.15, 0.26, and 0.4; 0\leq y \leq x)$ has been studied. The ferromagnetic transition temperature and the magnetization decrease with increasing amount of titanium. Complete substitution of $Mn^{4+}$ by $Ti^{4+}$, for x=y, excludes the $Mn^{3+}-O-Mn^{4+}$ double exchange. However, these compounds still show ferromagnetism if the dilution of the Mn sublattice by Ti is small enough $(y \leq 0.2)$. This ferromagnetism probably originates from a ferromagnetic $Mn^{3+} -O-Mn^{3+}$ superexchange. A thorough study of magnetic properties including AC magnetic susceptibility, magnetization, temperature dependence of coercivity and relaxation of remanent magnetization has been carried out and gives evidence of cluster spin glass behaviour for $La_{0.6} Pb_{0.4} Mn_{0.6} Ti_{0.4} O_3$.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Manganites;B-site substitution;Magnetization;Relaxation of remanent magnetization;Cluster glass;Colossal magnetoresistance
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 13 Jul 2006
Last Modified: 19 Sep 2010 04:29
URI: http://eprints.iisc.ernet.in/id/eprint/7876

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