Abstract
The oxygen-deficient polycrystalline La0.70Sr0.30MnO3−γ (0 < γ ≤ 0.2) manganites were studied by electron magnetic resonance (EMR). The EMR spectra provide evidence for an unusual and γ-dependent transition of manganites from the ferromagnetic phase to the paramagnetic phase. A Griffiths phase, which reveals itself in the coexistence of ferromagnetic and paramagnetic resonance signals at a temperature significantly higher than the magnetic ordering temperature, was found in samples with 0.1 ≤ γ ≤ 0.2. The formation of this phase, characterized by the presence of ferromagnetic clusters in a paramagnetic matrix, is due to an oxygen deficiency that hinders realization of long-range ferromagnetic ordering of the manganese ions.
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