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Structural, Magnetic, and Thermodynamic Properties of Ordered and Disordered Cobaltite Gd0.1Sr0.9CoO3 – δ

  • ORDER, DISORDER, AND PHASE TRANSITION IN CONDENSED SYSTEM
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Abstract

The effect of cationic and anionic orderings on the crystal structure and magnetic properties of substituted rare-earth cobaltites Gd0.1Sr0.9CoO3 – δ was studied using X-ray diffraction, measurement of XANES spectra, and magnetic and thermodynamic characteristics. The effects of ordering cause a decrease in symmetry to tetragonal and a distortion of the coordination octahedra of CoO6. Anomalous magnetic and thermodynamic quantities are observed at 260 and 360 K, respectively, for disordered and ordered samples. The XANES spectra measured at the CoK edge did not reveal a noticeable shift in the absorption edge compared with the spectrum of original GdCoO3. This suggests that the charge compensation process is associated not only with a change in the electronic state of cobalt ions, but also with the emergence of holes in the 2p states of oxygen.

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ACKNOWLEDGMENTS

The authors are grateful to L.A. Solov'ev for providing X-ray diffraction data and to M.S. Platunov for assistence in measurements of X-ray spectra.

Funding

This work was supported by the Russian Foundation for Basic Research (grant nos. 17-02-00826, 16-02-00507, and 18-52-00017 Bel_a) and by the Council on Grants of the President of the Russian Federation (SP-1844.2016.1). X-ray spectra were recorded using the equipment of a unique scientific facility Kurchatov Synchrotron Radiation Source financed by the Ministry of Education and Science of the Russian Federation (project ID RFMEFI61917X0007).

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Authors and Affiliations

  1. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

    V. A. Dudnikov, N. V. Kazak, Yu. S. Orlov, M. V. Gorev & S. G. Ovchinnikov

  2. Siberian Federal University, 660041, Krasnoyarsk, Russia

    Yu. S. Orlov & S. G. Ovchinnikov

  3. Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

    S. N. Vereshchagin

  4. Lebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    S. Yu. Gavrilkin & A. Yu. Tsvetkov

  5. National Research Center Kurchatov Institute, 123182, Moscow, Russia

    A. A. Veligzhanin & A. L. Trigub

  6. Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, 220072, Minsk, Belarus

    I. O. Troyanchuk

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  1. V. A. Dudnikov
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  2. N. V. Kazak
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Correspondence to Yu. S. Orlov.

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Translated by Andrey Zeigarnik

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Dudnikov, V.A., Kazak, N.V., Orlov, Y.S. et al. Structural, Magnetic, and Thermodynamic Properties of Ordered and Disordered Cobaltite Gd0.1Sr0.9CoO3 – δ. J. Exp. Theor. Phys. 128, 630–640 (2019). https://doi.org/10.1134/S1063776119020171

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