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., Voelzke, A., Komarek, A. C., Yamaura, K., Haverkort, M. W., Hu, Z. and Tjeng, L. H. (2019). Nature of the magnetism of iridium in the double perovskite Sr2CoIrO6. Phys. Rev. B, 100 (1). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Agrestini, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuo, C-YUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zhao, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lin, H-JUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, C-TUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rogalev, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ohresser, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chan, T-SUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Weng, S-CUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Auffermann, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Voelzke, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Komarek, A. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yamaura, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haverkort, M. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hu, Z.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tjeng, L. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-134458
DOI: 10.1103/PhysRevB.100.014443
Journal or Publication Title: Phys. Rev. B
Volume: 100
Number: 1
Date: 2019
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
RAY CIRCULAR-DICHROISM; STATE; TRANSITION; CA2RUO4Multiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/13445

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