Agrestini, S., Kuo, C-Y, Chen, K., Utsumi, Y., Mikhailova, D., Rogalev, A., Wilhelm, F., Foerster, T., Matsumoto, A., Takayama, T., Takagi, H., Haverkort, M. W., Hu, Z. and Tjeng, L. H. (2018). Probing the J(eff)=0 ground state and the Van Vleck paramagnetism of the Ir5+ ions in layered Sr2Co0.5Ir0.5O4. Phys. Rev. B, 97 (21). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We report a combined experimental and theoretical x-ray magnetic circular dichroism (XMCD) spectroscopy study at the Ir-L-2,L-3 edges on the Ir5+ ions of the layered hybrid solid state oxide Sr2Co0.5Ir0.5O4 with the K2NiF4 structure. From theoretical simulation of the experimental Ir-L-2,L-3 XMCD spectrum, we found a deviation from a pure J(eff) = 0 ground state with an anisotropic orbital-to-spin moment ratio (L-X/2S(X) = 0.43 and L-Z/2S(Z) = 0.78). This deviation is mainly due to multiplet interactions being not small compared to the cubic crystal field and due to the presence of a large tetragonal crystal field associated with the crystal structure. Nevertheless, our calculations show that the energy gap between the singlet ground state and the triplet excited state is still large and that the magnetic properties of the Ir5+ ions can be well described in terms of singlet Van Vleck paramagnetism.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Agrestini, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kuo, C-YUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chen, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Utsumi, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mikhailova, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rogalev, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wilhelm, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Foerster, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Matsumoto, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Takayama, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Takagi, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haverkort, M. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hu, Z.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tjeng, L. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-182483
DOI: 10.1103/PhysRevB.97.214436
Journal or Publication Title: Phys. Rev. B
Volume: 97
Number: 21
Date: 2018
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; SCATTERINGMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/18248

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