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Spin State and Spin-State Transition of Co3+ Ion in BiCoO3

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Wang,  Xiao
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hu,  Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kuo,  Chang-Yang
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Liu,  Cheng-En
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Zhao, J., Haw, S.-C., Wang, X., Hu, Z., Kuo, C.-Y., Chen, S.-A., et al. (2021). Spin State and Spin-State Transition of Co3+ Ion in BiCoO3. Physica Status Solidi B, 2100117, pp. 1-6. doi:10.1002/pssb.202100117.


Cite as: http://hdl.handle.net/21.11116/0000-0008-E7AE-0
Abstract
Confusion has arisen about the Co spin-state transition under high pressure for multiferroic BiCoO3. The crystal structure analysis indicates a high-spin (HS) to low-spin (LS) state transition with increasing pressure, while Co Kβ X-ray emission spectra present a high-spin to intermediate-spin (IS) state transition. Herein, the spin state of Co3+ in BiCoO3 is investigated utilizing soft X-ray absorption spectroscopy (XAS) at the Co-L2,3 and O-K edges at room temperature under ambient pressure. Furthermore, the spin state transition of Co3+ under high pressure is investigated by Co Kβ X-ray emission spectra. A pure HS-Co3+ ground state is found in the BiCoO3 sample prepared from the precursor and oxidizer mixed method—and the existence of a small part of LS-Co3+ in the BiCoO3 sample prepared from the precursor and oxidizer sandwiched method. A complete HS-Co3+ to LS-Co3+ transition is observed under high pressure up to 32.3 GPa. The results clarify the debate on the spin-state transition of BiCoO3 under high pressure and will deepen our understanding of the intrinsic physical properties on it. © 2021 Wiley-VCH GmbH