Abstract
By first-principles calculations, we study the magnetic and topological properties of -family compounds. The strongly coupled double magnetic atom-layers can significantly enhance the magnetic ordering temperature while keeping the topologically nontrivial properties. Particularly, is found to be a magnetic Weyl semimetal in bulk and a Chern insulator in thin film with both the Curie temperature ( K) and full gap well above 77 K. , and exhibit intrinsic dynamic axion state. Among them, has a Néel temperature over 200 K and even demonstrates antiferromagnetic order above room temperature. These results indicate an approach to realize high-temperature quantum anomalous Hall effect and other topological quantum effects for practical applications.
7 More- Received 9 December 2022
- Revised 5 July 2023
- Accepted 24 July 2023
DOI:https://doi.org/10.1103/PhysRevB.108.075117
©2023 American Physical Society