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Mössbauer and Magnetic Studies of Doped Lanthanum Manganite La1 – xCaxMn0.98Fe0.02O3 (x = 0.05, 0.10, 0.20): II. Stoichiometric Composition and Phase Segregation

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Abstract

Phase segregation in calcium-doped lanthanum manganite of stoichiometric composition La1 – xCaxMn0.98Fe0.02O3 (x = 0.05, 0.10, 0.20) is studied in a wide temperature range by Mössbauer spectroscopy, X-ray diffraction analysis, and magnetic methods. Structural phase segregation is the coexistence of three rhombic phases, I, II, and II*, described by the same space group Pnma and characterized by different types of magnetic ordering at low temperatures. Phase I transitions to the ferromagnetic state as the temperature decreases, and phases II and II* become antiferromagnetic. At 80 K, stoichiometric samples demonstrate a relaxation behavior which can be due to the presence of small-sized magnetic clusters. The relative content of the ferromagnetic phase increases with increasing Ca content, and the temperature of its magnetic transition grows.

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ACKNOWLEDGMENTS

We are grateful to Dr. G.E. Abrosimova for her assistance in interpreting X-ray data and to Prof. N.S. Perov for discussing the results of the 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, 142432, Chernogolovka, Moscow oblast, Russia

    V. D. Sedykh

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  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 (x = 0.05, 0.10, 0.20): II. Stoichiometric Composition and Phase Segregation. J. Surf. Investig. 13, 462–468 (2019). https://doi.org/10.1134/S1027451019030303

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  • DOI: https://doi.org/10.1134/S1027451019030303

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