|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Site Mixing Engineers the Magnetism of MnSb$_2$Te$_4$ | | Yaohua Liu
; Lin-Lin Wang
; Qiang Zheng
; Zengle Huang
; Xiaoping Wang
; Miaofang Chi
; Yan Wu
; Bryan C. Chakoumakos
; Michael A. McGuire
; Brian C. Sales
; Weida Wu
; Jiaqiang Yan
; | | Date: |
23 Jul 2020 | | Abstract: | The van der Waals compound, MnBi$_2$Te$_4$, is the first intrinsic magnetic
topological insulator, providing a materials platform for exploring exotic
quantum phenomena such as axion insulator state and quantum anomalous Hall
effect. However, intrinsic structural imperfections lead to bulk conductivity,
and the roles of magnetic defects are still unknown. Here, the impact of
antisite defects on the magnetism and electronic structure is studied in
MnSb$_2$Te$_4$, an isostructural compound of MnBi$_2$Te$_4$. Mn/Sb site mixing
leads to a complex magnetic structure and tunes the interlayer magnetic
coupling between antiferromagnetic (AFM) and ferromagnetic (FM). The detailed
nonstoichiometry and site-mixing of MnSb$_2$Te$_4$ crystals depend on the
growth parameters, which can lead to $sim$40\% of Mn sites occupied by Sb and
$sim$15\% of Sb sites by Mn in as-grown crystals. Single crystal neutron
diffraction and electron microscopy studies show nearly random distribution of
the antisite defects. Band structure calculations suggest that the Mn/Sb
site-mixing favors a FM interlayer coupling, consistent with experimental
observation, but is detrimental to the band inversion for a nontrivial
topology. Our results highlight the importance of investigating the presence,
distribution, and effects of magnetic impurities on the exotic physical
properties of intrinsic magnetic topological insulators. | | Source: | arXiv, 2007.12217 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER