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Mössbauer spectroscopy investigation of the La1/3Sr2/3FeO3 − δ perovskite

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Abstract

The charge state of iron in the La1/3Sr2/3FeO3 − δ perovskite has been studied using Mössbauer spectroscopy. It has been found that, as the temperature decreases in the range of 200-162 K, the charge disproportionation occurs according to the scheme 3Fe11/3+ → 2Fe3.5+ + Fe4+ and the antiferromagnetic phase is formed. The charge disproportionation is due to condensation of hole bipolarons. Each of bipolarons is collectivized by a group of three ions. The collectivization occurs according to the scheme [3Fe3+−2L] → [2Fe3+−L] + [Fe3+−L]. Simultaneously, the energy gap is formed with the maximum width of 0.14 ± 0.02 eV determined by Mössbauer spectroscopy.

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Authors and Affiliations

  1. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128, Russia

    A. P. Chernyshev, S. A. Petrov & N. F. Uvarov

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  1. A. P. Chernyshev
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  2. S. A. Petrov
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  3. N. F. Uvarov
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Correspondence to A. P. Chernyshev.

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Original Russian Text © A.P. Chernyshev, S.A. Petrov, N.F. Uvarov, 2014, published in Fizika Tverdogo Tela, 2014, Vol. 56, No. 12, pp. 2430–2434.

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Chernyshev, A.P., Petrov, S.A. & Uvarov, N.F. Mössbauer spectroscopy investigation of the La1/3Sr2/3FeO3 − δ perovskite. Phys. Solid State 56, 2519–2523 (2014). https://doi.org/10.1134/S1063783414120075

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  • DOI: https://doi.org/10.1134/S1063783414120075

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