Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6
We report on our investigation on the magnetism of the iridate double perovskite Sr2CoIrO6, a nominally Ir5+ Van Vleck Jeff=0 system. Using x-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD) spectroscopy at the Ir-L2,3 edges, we found a nearly zero orbital contribution to the magnet...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
31 July 2019
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| In: |
Physical review
Year: 2019, Volume: 100, Issue: 1 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.100.014443 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevB.100.014443 Verlag: https://link.aps.org/doi/10.1103/PhysRevB.100.014443 
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| Author Notes: | S. Agrestini, K. Chen, C.-Y. Kuo, L. Zhao, H.-J. Lin, C.-T. Chen, A. Rogalev, P. Ohresser, T.-S. Chan, S.-C. Weng, G. Auffermann, A. Völzke, A.C. Komarek, K. Yamaura, M.W. Haverkort, Z. Hu, and L.H. Tjeng |
| Summary: | We report on our investigation on the magnetism of the iridate double perovskite Sr2CoIrO6, a nominally Ir5+ Van Vleck Jeff=0 system. Using x-ray absorption (XAS) and x-ray magnetic circular dichroism (XMCD) spectroscopy at the Ir-L2,3 edges, we found a nearly zero orbital contribution to the magnetic moment and thus an apparent breakdown of the Jeff=0 ground state. By carrying out also XAS and XMCD experiments at the Co-L2,3 edges and by performing detailed full atomic multiplet calculations to simulate all spectra, we discovered that the compound consists of about 90% Ir5+ (Jeff=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. |
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| Item Description: | Im Titel ist sind die Zahlen "2" und "6" tiefgestellt Gesehen am 29.10.2019 |
| Physical Description: | Online Resource |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.100.014443 |