Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Agrestini, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kuo, C-Y UNSPECIFIED UNSPECIFIED UNSPECIFIED Zhao, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lin, H-J UNSPECIFIED UNSPECIFIED UNSPECIFIED Chen, C-T UNSPECIFIED UNSPECIFIED UNSPECIFIED Rogalev, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ohresser, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chan, T-S UNSPECIFIED UNSPECIFIED UNSPECIFIED Weng, S-C UNSPECIFIED UNSPECIFIED UNSPECIFIED Auffermann, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Voelzke, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Komarek, A. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yamaura, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Haverkort, M. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hu, Z. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tjeng, L. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language RAY CIRCULAR-DICHROISM; STATE; TRANSITION; CA2RUO4 Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13445