Effect of Hetrovalent substitution at Mn site on the Magnetic and Transport Properties of La$_{0.67}$Sr$_{0.33}$MnO$_3$

Details Effect of Hetrovalent substitution at Mn site on the Magnetic and Transport Properties of La$_{0.67}$Sr$_{0.33}$MnO$_3$ Effect of Hetrovalent substitution at Mn site on the Magnetic and Transport Properties of La$_{0.67}$Sr$_{0.33}$MnO$_3$

2007-06-18

arxiv.org/abs/0706.2568v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 8 figures, accepted in J. Magn. Magn. Magn. Mater

Scientific paper

10.1016/j.jmmm.2007.06.007

Magnetic and transport properties of Ti substituted La$_{0.67}$Sr$_{0.33}$MnO$_3$ are drastically affected with a change in preparation conditions. Low temperature infra-red absorption measurements reveal that this is perhaps due to inhomogeniety in substitution of Ti$^{4+}$ on Mn sites. It is found that, in the high temperature annealed samples, the substitution of Ti supresses the double exchange interaction due to the formation of Mn$^{3+}$-O-Ti$^{4+}$ chains. While in the low temperature annealed case substitution of Ti causes formation of isolated ferromagnetic clusters linked to each other by a variable range hopping polaron.

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