KLI

Ferromagnetism in β-Ag2Se topological semimetal

Metadata Downloads
Abstract
High-temperature ferromagnetism in materials composed of non-magnetic constituents is one of the most intriguing aspects in condensed matter physics as well as materials science. Beyond oxide compounds where the ferromagnetism is mainly induced by dilute magnetic dopants, a variety of unusual ferromag- netic materials, mostly fabricated artificially to control the magnetic and electronic properties, have been investigated for spintronic device applications. The unexpected ferromagnetism, attributed to strain and structural defects or proximity and interfacial effects, is now extended to quantum materials, despite prevailing controversy on its physical origin. Recently, the ferromagnetism observed in topological mate- rials with high mobility arising from the linear energy dispersion invokes new interest in the field of spintronics. Here, we report experimental verification of peculiar high-temperature ferromagnetism in β- Ag2Se topological semimetal, composed of non-magnetic constituents. We have fabricated stoichiometric Ag2Se (S-Ag2Se) and Ag-vacant Ag2Se (V-Ag2Se) samples. Contrary to non-magnetic behavior of S-Ag2Se, V- Ag2Se shows distinct ferromagnetic response up to room temperatures. First-principles calculations de- monstrate that the ferromagnetic ordering occurs only in V-Ag2Se if there is finite Hubbard U, which can be explained by self-trapped magnetic polaron model with strong p-d hybridization. High-temperature fer- romagnetism, especially in topological materials, allows exploring a significant new direction in material engineering for spintronic applications.
Author(s)
이성훈지상현김진수도 둑 꾸옹임성현홍순철박윤창이영행박대근Takeshi Toyama
Issued Date
2021
Type
Article
Keyword
FerromagnetismTopological semimetal
DOI
10.1016/j.jallcom.2021.162025
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9556
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_crossref_primary_10_1016_j_jallcom_2021_162025&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,Ferromagnetism%20in%20%CE%B2-Ag2Se%20topological%20semimetal&offset=0&pcAvailability=true
Publisher
JOURNAL OF ALLOYS AND COMPOUNDS
Location
네덜란드
Language
영어
ISSN
0925-8388
Citation Volume
891
Citation Number
16
Citation Start Page
162025
Citation End Page
162025
Appears in Collections:
Natural Science > Physics
Authorize & License
  • Authorize공개
Files in This Item:
  • There are no files associated with this item.

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.