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  Probing the Jeff = 0 ground state and the Van Vleck paramagnetism of the Ir5+ ions in layered Sr2Co0.5Ir0.5O4

Agrestini, S., Kuo, C.-Y., Chen, K., Utsumi, Y., Mikhailova, D., Rogalev, A., et al. (2018). Probing the Jeff = 0 ground state and the Van Vleck paramagnetism of the Ir5+ ions in layered Sr2Co0.5Ir0.5O4. Physical Review B, 97(21): 214436.

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Agrestini, S., Author
Kuo, C.-Y., Author
Chen, K., Author
Utsumi, Y., Author
Mikhailova, D., Author
Rogalev, A., Author
Wilhelm, F., Author
Förster, T., Author
Matsumoto, A., Author
Takayama, T., Author
Takagi, H.1, Author           
Haverkort, M. W., Author
Hu, Z., Author
Tjeng, L. H., Author
Affiliations:
1Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370487              

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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.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 744652
ISI: 000436907000002
 Degree: -

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Title: Physical Review B
Source Genre: Journal
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Publ. Info: COLLEGE PK : AMER PHYSICAL SOC
Pages: - Volume / Issue: 97 (21) Sequence Number: 214436 Start / End Page: - Identifier: ISSN: 2469-9950