2 CaOsO 6 assessed by x-ray magnetic dichroism measurements"> 2 CaOsO 6 assessed by x-ray magnetic dichroism measurements">

Article Possibility of ferro-octupolar order in Ba 2 CaOsO 6 assessed by x-ray magnetic dichroism measurements

G. Shibata (Japan Atomic Energy Agency) ; N. Kawamura (Japan Synchrotron Radiation Research Institute) ; J. Okamoto (National Synchrotron Radiation Research Center) ; A. Tanaka (Hiroshima University) ; H. Hayashi SAMURAI ORCID (NIMS) ; K. Yamaura SAMURAI ORCID (NIMS) ; H. Y. Huang (National Synchrotron Radiation Research Center) ; A. Singh (National Synchrotron Radiation Research Center) ; C. T. Chen (National Synchrotron Radiation Research Center) ; D. J. Huang (National Synchrotron Radiation Research Center) ; S. V. Streltsov (Institute of Metal Physics) ; A. Fujimori (Japan Atomic Energy Agency)

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G. Shibata, N. Kawamura, J. Okamoto, A. Tanaka, H. Hayashi, K. Yamaura, H. Y. Huang, A. Singh, C. T. Chen, D. J. Huang, S. V. Streltsov, A. Fujimori. Possibility of ferro-octupolar order in Ba 2 CaOsO 6 assessed by x-ray magnetic dichroism measurements. Physical Review B. 2026, 113 (16), . https://doi.org/10.1103/mh1b-q11n

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(abstract)

Localized 5d2 electrons in a cubic crystal field possess multipoles such as electric quadrupoles and magnetic octupoles. We studied the cubic double perovskite Ba2CaOsO6 containing the Os6+ (5d2) ions, which exhibits a phase transition to a ‘hidden order’ below T* ∼ 50 K, by X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) at the Os L2,3 edge. The cubic ligand-field splitting between the t2g and eg levels of Os 5d was deduced by XAS to be ∼4 eV. Ligand-field (LF) multiplet calculation under fictitious strong magnetic fields indicated that the exchange interaction between nearest-neighbor octupoles should be as strong as ∼1.5 meV if a ferrooctupolar order is stabilized in the ‘hidden-ordered’ state, consistent with the exchange interaction of ∼1 meV previously predicted theoretically using model and density functional theory calculations. The temperature dependence of the XMCD spectra was consistent with a ∼18 meV residual cubic splitting of the lowest Jeff = 2 multiplet state into the non-Kramers Eg doublet ground state and the T2g triplet excited state.

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Keyword: Ferro-octupolar order, Ba2CaOsO6, X-ray magnetic circular dichroism (XMCD), Spin-orbit coupling

Date published: 2026-04-28

Publisher: American Physical Society (APS)

Journal:

  • Physical Review B (ISSN: 24699950) vol. 113 issue. 16

Funding:

  • 日本学術振興会（JSPS） JP20K14416, JP22K03535, JP23K11709, JP25K01657 (科研費)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6267

First published URL: https://doi.org/10.1103/mh1b-q11n

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Updated at: 2026-04-30 12:01:11 +0900

Published on MDR: 2026-04-30 10:24:20 +0900

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