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The effect of Fe substitution on Mn sites in the colossal magnetoresistivecompounds La0.65Ca0.35Mn1-xFexO3 with 0.01<x<0.1 have been studied. A carefulstudy in the magnetic properties has been carried out by the measurement of acsusceptibility. The temperature range of CMR is greatly broadened with theaddition of Fe. Substitution of Fe induces a gradual transition from a metallicferromagnetic with a high Curie temperature (Tc=270 K) to a ferromagneticinsulator with low Tc=79 K. Increased spin disorder and decrease of Tc withincreasing Fe content are evident. The variations in the critical temperatureTc and magnetic moment show a rapid change at about 4-5% Fe. The effect of Feis seen to be consistent with the disruption of the Mn-Mn exchange possibly dueto the formation of magnetic clusters. An extra-ordinary behavior in the out ofphase part (x") of ac susceptibility, characterized by double bump (shoulder),was observed around x=0.01 and 0.02. The shoulder in x" disappears at x>0.04 Feconcentration. With increasing Fe concentration the x" peak shift to T<T1/2(mid point of the transition temperature) and becomes broader. The x" peakmoves to 8 or 10 K higher temperature on the application of a dc field, for 3 &4% samples. We also see increasing low temperature dissipation in more stronglyFe doped samples i.e. increasing the Fe, leads to increased spin disorder anddissipation at low temperature. The effect of the dc field is discussed interms of the suppression of spin fluctuations close to Tc. The same ionic radiiof Fe3+ and Mn3+ cause no structure changes in either series, yetferromagnetism has been consistently suppressed by Fe doping. Doping with Febypasses the usually dominant lattice effects, but depopulate the hoppingelectrons and thus weakens the double exchange. The results were explained interms of the formation of magnetic clusters of Fe ions.

AC Susceptibility Studies in Fe doped La0.65Ca0.35Mn1-xFexO3: Rare Earth Manganites