Electron spin resonance study of the magnetic states in the Pr0.2Sr0.8Mn1−xRuxO3 (x = 0, 0.1)

The effect of the substitution of ruthenium for manganese in a series of Pr0.2Sr0.8MnO3 has been studied by electron spin resonance (ESR) for temperature ranging from 130 to 300 K. The ESR spectra display a single line in the whole temperature range. The temperature dependence of the line width and the effective g factor (geff) show the presence of the C-type antiferromagnetic to paramagnetic (AFM-PM) transition at about 275 K for both doped and undoped samples. The larger increase of geff for the composition Pr0.2Sr0.8Mn0.9Ru0.1O3 was attributed to the presence of ferromagnetic (FM) interactions in the AFM state. Such a presence was confirmed by an increase of the magnetization values to 0.17 μB at 5 K.