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Oxygen-driven competition between low-dimensional structures of Sr3CoMO6 and Sr3CoMO7−δ with M = Ru, Ir

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Mikhailova,  Daria
Daria Mikhailova, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Reichel,  Phillip
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mogare,  Kailash M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schmidt,  Marcus
Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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

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Citation

Mikhailova, D., Reichel, P., Tsirlin, A. A., Abakumov, A. M., Senyshyn, A., Mogare, K. M., et al. (2014). Oxygen-driven competition between low-dimensional structures of Sr3CoMO6 and Sr3CoMO7−δ with M = Ru, Ir. Dalton Transactions, 43(37), 13883-13891. doi:10.1039/C4DT01893A.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0023-C9E6-1
Abstract
We have realized a reversible structure transformation of one-dimensional 1D K4CdCl6-type Sr3CoMO6 with the Co2+/M4+ cation ordering into the two-dimensional 2D double layered Ruddlesden–Popper structure Sr3CoMO7−δ with a random distribution of Co and M (with M = Ru, Ir) upon increasing the partial oxygen pressure. The combined soft and hard X-ray absorption spectroscopy studies show that under transformation, Co and M cations were oxidized to Co3+ and M5+. During oxidation, high-spin Co2+ in Sr3CoMO6 first transforms into high-spin Co3+ in oxygen-deficient Sr3CoMO7−δ, and then further transforms into low-spin Co3+ in fully oxidized Sr3CoMO7 upon further increasing the partial pressure of oxygen. The 1D Sr3CoMO6 compound is magnetically ordered at low temperatures with the magnetic moments lying along the c-axis. Their alignment is parallel for Sr3CoRuO6 and antiparallel for Sr3CoIrO6. The 2D compounds reveal a spin-glass-like behavior related to the random distribution of magnetic cations in the structure.