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Effect of Hetrovalent substitution at Mn site on the Magnetic and Transport Properties of LaSrMnO
Magnetic and transport properties of Ti substituted
LaSrMnO 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
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-O-Ti 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.Comment: 11 pages, 8 figures, accepted in J. Magn. Magn. Magn. Mate