<i>p</i> ‐Orbital Ferromagnetism Arising from Unconventional O <sup>−</sup> Ionic State in a New Semiconductor Sr <sub>2</sub> AlO <sub>4</sub> with Insufficiently Bonded Oxygen (Adv. Sci. 1/2025)
p‐Orbital Ferromagnetism This image illustration features an unconventional O. ionic state producing p‐electron orbital ferromagnetism in a luminescent crystal. In the fiber‐like new semiconductor Sr(2)AlO(4) that emits green light upon a mechanical stimulus, one oxygen ion per Sr(2)AlO(4) is insufficiently bonded to the surrounding cations of Sr and Al, leading to the unconventional O(−) ionic state. Unlike a conventional O(2−) ionic state, wherein all electrons in its outer p orbitals are paired as ↑↓ ↑↓ ↑↓ with a null magnetic moment, the unconventional O(−) has one unpaired electron spin of ↑↓ ↑↓ ↑ to produce strong ferromagnetism persisting to a surprising high temperature. More details can be found in article number 2410977 by Xu‐Guang Zheng, Chao‐Nan Xu, and co‐workers. [Image: see text]
Authors
- Ichihiro Yamauchi (ORCID: https://orcid.org/0000-0002-2285-1784)
- Tomasz Galica (ORCID: https://orcid.org/0000-0001-5762-8163)
- Tomoki Uchiyama (ORCID: https://orcid.org/0000-0003-4880-7498)
- Chao‐Nan Xu (ORCID: https://orcid.org/0000-0002-7713-7131)
- Ying Chen (ORCID: https://orcid.org/0000-0002-3533-0208)
- 旭光 鄭 (ORCID: https://orcid.org/0000-0002-8094-5148)
- Eiji Nishibori (ORCID: https://orcid.org/0000-0002-4192-6577)
Publication Details
- Journal
- Advanced Science
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1002/advs.202570007
- Primary Topic
- Magnetic and transport properties of perovskites and related materials
- Type
- article
- Field-Weighted Citation Impact
- 0.00