Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

Agrestini, S.; Chen, K.; Kuo, C.-Y.; Zhao, L.; Lin, H-J; Chen, C-T; Rogalev, A.; Ohresser, P.; Chan, T-S; Weng, S-C; Auffermann, G.; Völzke, A.; Komarek, A. C.; Yamaura, K.; Haverkort, M. W.; Hu, Z.; Tjeng, L. H.

doi:10.1103/PhysRevB.100.014443

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Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

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Agrestini, S.
Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kuo, C.-Y.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zhao, L.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Auffermann, G.
Gudrun Auffermann, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Völzke, A.
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Komarek, A. C.
Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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

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Tjeng, L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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引用

Agrestini, S., Chen, K., Kuo, C.-Y., Zhao, L., Lin, H.-J., Chen, C.-T., Rogalev, A., Ohresser, P., Chan, T.-S., Weng, S.-C., Auffermann, G., Völzke, A., Komarek, A. C., Yamaura, K., Haverkort, M. W., Hu, Z., & Tjeng, L. H. (2019). Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6. Physical Review B, 100(1):, pp. 1-9. doi:10.1103/PhysRevB.100.014443.

引用: https://hdl.handle.net/21.11116/0000-0004-753A-8

要旨

We report on our investigation on the magnetism of the iridate double perovskite Sr2CoIrO6, a nominally Ir5+ Van Vleck J(eff) = 0 system. Using x-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD) spectroscopy at the Ir-L-2,L-3 edges, we found a nearly zero orbital contribution to the magnetic moment and thus an apparent breakdown of the J(eff) = 0 ground state. By carrying out also XAS and XMCD experiments at the Co-L-2,L-3 edges and by performing detailed full atomic multiplet calculations to simulate all spectra, we discovered that the compound consists of about 90% Ir5+ (J(eff) = 0) and Co3+ (S = 2) and 10% Ir6+ (S = 3/2) and Co2+ (S = 3/2). The magnetic signal of this minority Ir6+ component is almost equally as strong as that of the main Ir5+ component. We infer that there is a competition between the Ir5+-Co3+ and the Ir6+-Co2+ configurations in this stoichiometric compound.