Abstract
The X-ray diffraction patterns, susceptibility, electron magnetic resonance and resistivity in La 0.67Sr 0.33Mn 1− x Fe x O 3 have been studied systematically. With increasing Fe concentration, T c and the shift of resonance field H r decrease, the resistivity (two resistivity transition peaks were observed in x=0.07, 0.10) increases, but the lattice constants remain almost unchanged. When x=0.23, the spin glass-like state is observed and the system behaves insulator-like. The above results strongly suggest that the dopant Fe ions weaken the double exchange interaction.
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