Possible Altermagnetic Band Splitting in a Fe Spin Ladder System: Angle-Resolved Photoemission Spectroscopy on BaFe <sub>2</sub> S <sub>3</sub>
We have studied the electronic structure of BaFe2S3, which is a Mott insulator with two-leg ladder structure and exhibits superconductivity under pressure, by means of angle-resolved photoemission spectroscopy. The intense spectral features with small dispersion around −0.8 and −2.0 eV are respectively attributed to Fe 3d t2g and eg bands with localized character. The weak and broad feature is observed around −0.2 eV and can be assigned to a rather itinerant eg band, which unexpectedly exhibits an energy splitting below the magnetic transition temperature. The band splitting is potentially related to altermagnetism or a novel type of ferroic order in the two-leg ladder system.
Authors
- Kenya Ohgushi (ORCID: https://orcid.org/0009-0007-5397-6321)
- Masashi Arita (ORCID: https://orcid.org/0000-0003-0743-4381)
- T. Mizokawa (ORCID: https://orcid.org/0000-0002-7682-2348)
- N. L. Saini (ORCID: https://orcid.org/0000-0003-3684-1517)
- Shinnosuke Takaya
- Kazuki Hashizume
- Kou Takubo (ORCID: https://orcid.org/0000-0002-2591-1244)
- Takuya Aoyama (ORCID: https://orcid.org/0000-0002-4481-0801)
- Shun Iwasaki
Institutions
- Hiroshima University (JP)
- Waseda University (JP)
- Tohoku University (JP)
- Sapienza University of Rome (IT)
Publication Details
- Journal
- Journal of the Physical Society of Japan
- Published
- 2025-11-20
- DOI
- https://doi.org/10.7566/jpsj.94.123704
- Primary Topic
- Iron-based superconductors research
- Type
- article
- Field-Weighted Citation Impact
- 0.00