Abstract
Electron spin resonance (ESR) was carried out on the La 0.7Ba 0.3Mn 1− x Fe x O 3 ( x=0.08–0.2) compounds over the temperature range of 100–300 K. We observed that the temperature dependence of the EPR spectra has a phase separation phenomenon below T C for x=0.08–0.15 samples. Phase transition and temperature dependence of ESR, g eff value, linewidth, and intensity were determined. The g-value increases gradually with decrease in temperature in the paramagnetic state. The activation energies obtained from the temperature dependence of resonance intensity and linewidth are smaller in the Fe-doped sample. The ferromagnetic spin correlations would be significantly weakened by partially substituting the Mn with Fe.
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