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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.

権利情報:

• In Copyright
  

  ©2026 American Physical Society

キーワード: Ferro-octupolar order, Ba2CaOsO6, X-ray magnetic circular dichroism (XMCD), Spin-orbit coupling

刊行年月日: 2026-04-28

出版者: American Physical Society (APS)

掲載誌:

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

研究助成金:

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

原稿種別: 著者最終稿 (Accepted manuscript)

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

公開URL: https://doi.org/10.1103/mh1b-q11n

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更新時刻: 2026-04-30 12:01:11 +0900

MDRでの公開時刻: 2026-04-30 10:24:20 +0900