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Spin State of the Co3+ Ions in the Layered TbBaCo2O5.5 Cobaltite in the Metal–Insulator Transition Range

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

A scheme is proposed to describe the spin state of the Co3+ ions in the layered TbBaCo2O5.5 cobaltite near the metal–insulator transition. The spin state of the Co3+ ions in the metallic phase corresponds to a mixture of the HS(\(t_{{2g}}^{4}\)\(e_{g}^{2}\), S = 2) and LS(\(t_{{2g}}^{6}\)\(e_{g}^{0}\), S = 0) states taken at approximately the same proportion. The transition into a nonmetallic state occurs due to the transformation of the HS state into the LS state in octahedra and part of the LS state into the IS(\(t_{{2g}}^{5}\)\(e_{g}^{1}\), S = 1) state in pyramids (near TC ~ 280 K). The proposed scheme agrees with the well-known structural data obtained for the TbBaCo2O5.5 cobaltites. As follows from volumetric and linear expansion, the transition takes place over a wide temperature range T ≈ TMI ± 50 K. The study of thermal expansion shows that an LS/IS state is retained down to T = 80 K.

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Notes

  1. As follows from [13], the field dependence of the magnetization M(H) of the GdBaCo2O5.5 sample studied in [4, 7] is well described by Eq. (3) with the parameters of the free Gd3+ ion at θPM = –1 K.

  2. As follows from [13], the Co3+ ions in the metallic phase of PrBaCo2O5.50 are in an HS/IS state at the ratio 1 : 1 if the PM contribution is taken into account.

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ACKNOWLEDGMENTS

We thank A.V. Korolev and D.A. Shishkin for the magnetic measurements, as well as A.V. Telegin for fruitful discussion.

Funding

This work was performed in terms of a state assignment of the Federal Agency of Scientific Organizations, project Spin no. AAAA-A18-118020290104-2. This work was supported in part by the Russian Foundation for Basic Research (project 20-02-00461).

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Authors and Affiliations

  1. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 620108, Yekaterinburg, Russia

    N. I. Solin, S. V. Naumov & V. A. Kazantsev

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  1. N. I. Solin
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  2. S. V. Naumov
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  3. V. A. Kazantsev
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Correspondence to N. I. Solin.

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Translated by K. Shakhlevich

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Solin, N.I., Naumov, S.V. & Kazantsev, V.A. Spin State of the Co3+ Ions in the Layered TbBaCo2O5.5 Cobaltite in the Metal–Insulator Transition Range. J. Exp. Theor. Phys. 130, 690–698 (2020). https://doi.org/10.1134/S1063776120050106

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  • DOI: https://doi.org/10.1134/S1063776120050106

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