Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

• Verfasst von: Agrestini, Stefano [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6
• Verf.angabe: 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
• E-Jahr: 2019
• Jahr: 31 July 2019
• Umfang: 9 S.
• Fussnoten: Im Titel ist sind die Zahlen "2" und "6" tiefgestellt ; Gesehen am 29.10.2019
• Titel Quelle: Enthalten in: Physical review
• Ort Quelle: Woodbury, NY : Inst., 2016
• Jahr Quelle: 2019
• Band/Heft Quelle: 100(2019,1) Artikel-Nummer 014443 9 Seiten
• ISSN Quelle: 2469-9969
• DOI: doi:10.1103/PhysRevB.100.014443
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1680632167

Abstract

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.