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Effect of the Oxygen Content on the Metal‒Insulator Transition and on the Spin State of Co3+ Ions in the Layered NdBaCo2O5 + δ Cobaltite (0.37 ≤ δ ≤ 0.65)

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The effect of the oxygen content δ in layered NdBaCo2O5 + δ cobaltite, where 0.37 ≤ δ ≤ 0.65, on the metal‒insulator transition, as well as on the magnetic and spin states of Co3+, is studied for the first time. An increase in δ reduces the metal‒insulator transition temperature TMI, the antiferromagnetic ordering temperature TN, and the Curie temperature TC by about 100–150 K. For all values of δ, the metal‒insulator transition occurs when the spin state of Co3+ ions changes from the HS/LS state in the metallic phase to the IS/LS state in the semiconducting phase, whereas with an increase in δ, the spin state of Co3+ ions changes from the IS/LS to HS/LS state. At δ ~ 0.65, a heavily doped semiconductor–bad metal transition occurs without any change in the spin state of Co3+ ions. The ferromagnetic behavior of NdBaCo2O5 + δ in the antiferromagnetic phase below TN is interpreted in terms of the metamagnetic model as the effect of the size of the rare earth Nd3+ ion on the antiferromagnetic state in layered cobaltites.

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ACKNOWLEDGMENTS

We are grateful to A.V. Telegin for fruitful discussions and to A.V. Korolev for his assistance with the magnetic measurements.

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation (state assignment no. AAAA-A18-118020290104-2, project Spin) and partially by the Russian Foundation for Basic Research (project no. 20-02-00461).

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

    N. I. Solin & S. V. Naumov

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  1. N. I. Solin
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  2. S. V. Naumov
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Correspondence to N. I. Solin.

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Translated by K. Kugel

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Solin, N.I., Naumov, S.V. Effect of the Oxygen Content on the Metal‒Insulator Transition and on the Spin State of Co3+ Ions in the Layered NdBaCo2O5 + δ Cobaltite (0.37 ≤ δ ≤ 0.65). Jetp Lett. 115, 531–538 (2022). https://doi.org/10.1134/S0021364022100472

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