Abstract
Electron spin resonance (ESR) study was carried out on La 0.67Ca 0.33Mn 1− x Fe x O 3 ( x=0.0, 0.04) samples. The temperature dependence of the ESR spectra indicates the presence of phase separation above and below T C in x=0.0 and 0.04 sample, respectively. The increase of the g-value in the high-temperature region indicates the existence of local spin correlations even in the paramagnetic state. The activation energy obtained from both the temperature dependence of the ESR intensity and linewidth exhibits a smaller value in the Fe-doped sample. Our study suggests that the ferromagnetic spin correlations would be significantly weakened by a slight doping of Fe ions on Mn sites.
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