Complex studies of La0.6Sr0.2Mn(1.2-x)Fe(x)O3 (x = 0; 0.02; 0.05; 0.1) manganites have been performed. Interrelation between the Fe ions concentration and CMR, magneto-transport and 55Mn NMR properties is established. It is shown that the magnetoresistance is increased, temperatures of magnetic and metal-insulator transitions as well as resonance frequency of 55Mn NMR is decreased and 55Mn NMR spectrum is expanded towards lower frequencies with increasing Fe content. These particularities are shown to be due to the weakening in change interactions between Mn ions as a result of both Fe doping and occurrence of defects of vacancy and cluster types.

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