Abstract: Systematic studies of the transport properties of La_0.67Ca_0.33Mn_1-xFe_xO₃ (x=0-0.3) systems showed that with increasing Fe-doping content x the resistance increases and the insulator-metal transition temperature moves to lower temperature. For small doping content, the transport property satisfies metal transport behavior below the transition temperature, and above the transition temperature it satisfies the small polaron model. This behavior can be explained by Fe³⁺ doping, which easily forms Fe³⁺-O^2--Mn⁴⁺ channel, suppressing the double exchange Mn³⁺-O^2--Mn⁴⁺ channel and enhancing the spin scattering of Mn ions induced by antiferromagnetic clusters of Fe ions.

Key words: La_2/3Ca_1/3MnO₃, Fe-doping, Crystal structure, Transport properties

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