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Electronic States of Cobalt Ions in EuBaCo2O5 + δ Layered Cobaltites

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The oxygen K-edge X-ray absorption spectra in EuBaCo2O5.52 ± 0.02 and EuBaCo2O5.24 ± 0.02 cobaltites are measured at temperatures of 300 and 440 K, which are below and above the metal–insulator transition temperature, respectively. According to these spectra, the substitution of Co2+ ions for some Co3+ ions with a decrease in the oxygen content in the chemical formula of a cobaltite and, hence, an increase in the relative fraction of CoO5 pyramids with respect to the number of CoO6 octahedra leads to an increase in the band gap by about 0.3 eV. The band structure of EuBaCo2O5.5 is calculated using the method of linearized muffin-tin orbitals in the local density approximation taking into account the local Coulomb interaction. It is found that the low-spin state of Co3+ ions occurs in CoO6 octahedra in EuBaCo2O5.5, whereas the high-spin state of Co3+ ions is typical of cobalt ions in pyramids.

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Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation (state assignment no. АААА-А18-118020190098-5, project Electron, and state assignment no. AAAA-A18-118020290104-2, project Spin) and partially by the Russian Foundation for Basic Research (project no. 20-02-00461). The measurements of X-ray spectra were partially supported by the bilateral Russian–German Laboratory at BESSY. M.S. Udintseva acknowledges the support of the Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences (project no. M 8-21).

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Authors and Affiliations

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

    M. S. Udintseva, A. V. Efremov, S. V. Naumov, S. N. Shamin & V. R. Galakhov

  2. Institute of Solid State and Material Physics, Dresden University of Technology, 01062, Dresden, Germany

    D. Smirnov

  3. Physikalische Chemie Institut für Chemie und Biochemie, Freie Universität Berlin, 14195, Berlin, Germany

    A. Makarova

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  1. M. S. Udintseva
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  2. A. V. Efremov
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  7. V. R. Galakhov
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Correspondence to M. S. Udintseva.

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Translated by K. Kugel

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Udintseva, M.S., Efremov, A.V., Smirnov, D. et al. Electronic States of Cobalt Ions in EuBaCo2O5 + δ Layered Cobaltites. Jetp Lett. 114, 475–478 (2021). https://doi.org/10.1134/S002136402120011X

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  • DOI: https://doi.org/10.1134/S002136402120011X

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