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Effect of Eu doping and partial oxygen isotope substitution on magnetic phase transitions in (Pr1 − y Eu y )0.7Ca0.3CoO3 cobaltites

  • Order, Disorder, and Phase Transition in Condensed System
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Abstract

We study experimentally and theoretically the effect of Eu doping and partial oxygen isotope substitution on the transport and magnetic characteristics and spin-state transitions in (Pr1 − y Eu y )0.7Ca0.3CoO3 cobaltites. The Eu doping level y is chosen in the range of the phase diagram near the crossover between the ferromagnetic and spin-state transitions (0.10 < y < 0.20). We prepared a series of samples with different degrees of enrichment by the heavy oxygen isotope 18O, namely, with 90, 67, 43, 17, and 0% of 18O. Based on the measurements of the ac magnetic susceptibility χ(T) and electrical resistivity ρ(T), we analyze the evolution of the sample properties with a change of the Eu and 18O content. It is demonstrated that the effect of increasing the 18O content on the system is similar to that of increasing the Eu content. The band structure calculations of the energy gap between t 2g and e g bands including the renormalization of this gap due to the electron-phonon interaction reveals the physical mechanisms underlying this similarity.

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Authors and Affiliations

  1. National Research Center “Kurchatov Institute,”, Moscow, 123182, Russia

    N. A. Babushkina & A. N. Taldenkov

  2. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, 620990, Russia

    S. V. Streltsov

  3. Ural Federal University, Yekaterinburg, 620002, Russia

    S. V. Streltsov

  4. All-Russian Electrical Engineering Institute, Moscow, 111250, Russia

    A. V. Kalinov

  5. Department of Chemistry, Moscow State University, Moscow, 119991, Russia

    T. G. Kuzmova, A. A. Kamenev & A. R. Kaul

  6. II. Physikalisches Institut, Universität zu Köln, Köln, 50937, Germany

    D. I. Khomskii

  7. Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Moscow, 125412, Russia

    K. I. Kugel

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  1. N. A. Babushkina
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  2. A. N. Taldenkov
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  3. S. V. Streltsov
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  4. A. V. Kalinov
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  8. D. I. Khomskii
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Correspondence to N. A. Babushkina.

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Babushkina, N.A., Taldenkov, A.N., Streltsov, S.V. et al. Effect of Eu doping and partial oxygen isotope substitution on magnetic phase transitions in (Pr1 − y Eu y )0.7Ca0.3CoO3 cobaltites. J. Exp. Theor. Phys. 118, 266–278 (2014). https://doi.org/10.1134/S1063776114010026

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  • DOI: https://doi.org/10.1134/S1063776114010026

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