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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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 84, No. 4, pp. 664–667, July–August, 2017.
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Adashkevich, S.V., Markevich, S.A., Trukhanov, S.V. et al. Observation of Griffiths Phase in Oxygen-Deficient La0.70Sr0.30MnO3−γ by Electron Magnetic Resonance. J Appl Spectrosc 84, 683–686 (2017). https://doi.org/10.1007/s10812-017-0530-3
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DOI: https://doi.org/10.1007/s10812-017-0530-3