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Mössbauer and Magnetic Studies of Doped Lanthanum Manganite La1 – xCaxMn0.98Fe0.02O3 + δ (x = 0.05, 0.10, 0.20): I. Nonstoichiometric Composition

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Abstract

Mössbauer and magnetic studies of Ca-doped lanthanum manganites La1 – xCaxMn0.98Fe0.02O3 + δ (x = 0.05, 0.10, 0.20) of a nonstoichiometric composition are performed. An increase in the Ca concentration and a decrease in the interstitial oxygen quantity results in a decreasing electric-field gradient in the region of the Fe atomic nucleus due to the spatial rearrangement of the charge of surrounding atoms. The Mössbauer spectra of all studied lanthanum-manganite samples demonstrate a relaxation character at low temperatures, which can be associated with the presence of small-sized magnetic clusters. This finding correlates with the results of magnetic investigations. The values of the coercive force, saturation magnetization, and blocking temperature are determined.

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ACKNOWLEDGMENTS

We are grateful to Dr. G.E. Abrosimova for assistance in interpreting the X-ray data and to Prof. N.S. Perov for discussing the results of magnetic measurements.

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

    D. I. Pchelina, I. Yu. Medvetskaya, N. I. Chistyakova, V. S. Rusakov & Yu. A. Alekhina

  2. Institute of Solid State Physics, Russian Academy of Sciences, Moscow oblast, 142432, Chernogolovka, Russia

    V. D. Sedykh

Authors
  1. D. I. Pchelina
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  2. I. Yu. Medvetskaya
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  3. N. I. Chistyakova
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  4. V. S. Rusakov
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  5. V. D. Sedykh
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  6. Yu. A. Alekhina
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Correspondence to V. D. Sedykh.

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Translated by S. Efimov

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Pchelina, D.I., Medvetskaya, I.Y., Chistyakova, N.I. et al. Mössbauer and Magnetic Studies of Doped Lanthanum Manganite La1 – xCaxMn0.98Fe0.02O3 + δ (x = 0.05, 0.10, 0.20): I. Nonstoichiometric Composition. J. Surf. Investig. 12, 1047–1051 (2018). https://doi.org/10.1134/S1027451018050476

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  • DOI: https://doi.org/10.1134/S1027451018050476

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