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  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., et al. (2019). Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6. Physical Review B, 100(1): 014443, pp. 1-9. doi:10.1103/PhysRevB.100.014443.

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Agrestini, S.1, Autor           
Chen, K.2, Autor
Kuo, C.-Y.3, Autor           
Zhao, L.3, Autor           
Lin, H-J2, Autor
Chen, C-T2, Autor
Rogalev, A.2, Autor
Ohresser, P.2, Autor
Chan, T-S2, Autor
Weng, S-C2, Autor
Auffermann, G.4, Autor           
Völzke, A.5, Autor           
Komarek, A. C.6, Autor           
Yamaura, K.2, Autor
Haverkort, M. W.2, Autor
Hu, Z.7, Autor           
Tjeng, L. H.8, Autor           
Affiliations:
1Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863459              
2External Organizations, ou_persistent22              
3Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
4Gudrun Auffermann, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863432              
5Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
6Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863446              
7Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
8Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              

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 Zusammenfassung: 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.

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Sprache(n): eng - English
 Datum: 2019-07-312019-07-31
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1103/PhysRevB.100.014443
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Titel: Physical Review B
  Kurztitel : Phys. Rev. B
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, NY : American Physical Society
Seiten: - Band / Heft: 100 (1) Artikelnummer: 014443 Start- / Endseite: 1 - 9 Identifikator: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008