# Possibility of ferro-octupolar order in Ba                    <math display="inline">                      <msub>                        <mi></mi>                        <mn>2</mn>                      </msub>                    </math>                    CaOsO                    <math display="inline">                      <msub>                        <mi></mi>                        <mn>6</mn>                      </msub>                    </math>                    assessed by x-ray magnetic dichroism measurements

https://mdr.nims.go.jp/datasets/fac7c47e-3ab3-4d1c-a44f-91e776b77259

## File

- [Ba2CaOsO6_XMCD_MDR.pdf](https://mdr.nims.go.jp/filesets/be148472-0331-4a4a-8547-c27f40e2cbe3/download) ([Detail](https://mdr.nims.go.jp/filesets/be148472-0331-4a4a-8547-c27f40e2cbe3.md))

## Id

fac7c47e-3ab3-4d1c-a44f-91e776b77259

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-04-29T00:00:58.486843Z

## Updated at

2026-04-30T03:01:11.491392Z

## Published at

2026-04-30T01:24:20.760153Z

## Doi

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

## First published url

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

## Date published

2026-04-28

## Recorded date published

2026-4

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Possibility of ferro-octupolar order in Ba                    <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"
    display="inline">                      <mml:msub>                        <mml:mi/>                        <mml:mn>2</mml:mn>                      </mml:msub>                    </mml:math>                    CaOsO                    <mml:math
    xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline">                      <mml:msub>                        <mml:mi/>                        <mml:mn>6</mml:mn>                      </mml:msub>                    </mml:math>                    assessed
    by x-ray magnetic dichroism measurements
  title_type: original
  lang: en

## Description

- description: 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.
  description_type: abstract
  lang: und

## Creator

- name: G. Shibata
  role: author
  organization: Japan Atomic Energy Agency
- name: N. Kawamura
  role: author
  organization: Japan Synchrotron Radiation Research Institute
- name: J. Okamoto
  role: author
  organization: National Synchrotron Radiation Research Center
- name: A. Tanaka
  role: author
  organization: Hiroshima University
- name: H. Hayashi
  role: author
  orcid: https://orcid.org/0000-0001-7787-9082
  organization: NIMS
- name: K. Yamaura
  role: author
  orcid: https://orcid.org/0000-0003-0390-8244
  organization: NIMS
- name: H. Y. Huang
  role: author
  organization: National Synchrotron Radiation Research Center
- name: A. Singh
  role: author
  organization: National Synchrotron Radiation Research Center
- name: C. T. Chen
  role: author
  organization: National Synchrotron Radiation Research Center
- name: D. J. Huang
  role: author
  organization: National Synchrotron Radiation Research Center
- name: S. V. Streltsov
  role: author
  organization: Institute of Metal Physics
- name: A. Fujimori
  role: author
  organization: Japan Atomic Energy Agency

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: Ferro-octupolar order
  schema: not_defined
- subject: Ba2CaOsO6
  schema: not_defined
- subject: X-ray magnetic circular dichroism (XMCD)
  schema: not_defined
- subject: Spin-orbit coupling
  schema: not_defined

## Rights

- description: "©2026 American Physical Society"
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Physical Review B
  issn: '24699950'
  volume: '113'
  issue: '16'

## Conference



## Related item



## Funding

- identifier: JP20K14416, JP22K03535, JP23K11709, JP25K01657
  funder_name: 日本学術振興会（JSPS）
  description: 科研費

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: be148472-0331-4a4a-8547-c27f40e2cbe3
  filename: Ba2CaOsO6_XMCD_MDR.pdf
  content_type: application/pdf
  size: 1619255
  md5: f2b129eedbc74b4e6d35526a6c7bc6ca

## Thumbnail

fileset_id: be148472-0331-4a4a-8547-c27f40e2cbe3
filename: Ba2CaOsO6_XMCD_MDR.pdf