Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6

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, L. H. Tjeng

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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.

Original languageEnglish
Article number014443
JournalPhysical Review B
Volume100
Issue number1
DOIs
StatePublished - 31 Jul 2019

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