Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45-50 K

doi:10.1002/adma.202102935

Эндаумент фонд ТГУ!
Впиши своё имя в историю университета
- Сделать пожертвование -

Add to "Quick Collection"

Description	Size	Format
Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45-50 K	4 MB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1002/adma.202102935

#магнитные топологические изоляторы

#ферромагнитный гистерезис

#магнитная анизотропия

#спиновая поляризация

Title: Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45-50 K
Creator: Wimmer, Stefan
|
Sánchez-Barriga, Jaime
|
Küppers, Philipp
|
Ney, Andreas
|
Schierle, Enrico
|
Freyse, Friedrich
|
Caha, Ondre
|
Michalička, Jan
|
Liebmann, Marcus
|
Primetzhofer, Daniel
|
Hoffman, Martin
|
Ernst, Arthur
|
Otrokov, Mikhail M.
|
Bihlmayer, Gustav
|
Weschke, Eugen
|
Lake, Bella
|
Chulkov, Evgueni V.
|
Morgenstern, Markus
|
Bauer, Günther
|
Springholz, Gunther
|
Rader, Oliver
Date: 2021
DOI: 10.1002/adma.202102935
Description: Ferromagnetic topological insulators exhibit the quantum anomalous Hall effect, which is potentially useful for high-precision metrology, edge channel spintronics, and topological qubits. The stable 2+ state of Mn enables intrinsic magnetic topological insulators. MnBi2Te4 is, however, antiferromagnetic with 25 K Neel temperature and is strongly n-doped. In this work, p-type MnSb2Te4, previously considered topologically trivial, is shown to be a ferromagnetic topological insulator for a few percent Mn excess. i) Ferromagnetic hysteresis with record Curie temperature of 45-50 K, ii) out-of-plane magnetic anisotropy, iii) a 2D Dirac cone with the Dirac point close to the Fermi level, iv) out-of-plane spin polarization as revealed by photoelectron spectroscopy, and v) a magnetically induced bandgap closing at the Curie temperature, demonstrated by scanning tunneling spectroscopy (STS), are shown. Moreover, a critical exponent of the magnetization beta approximate to 1 is found, indicating the vicinity of a quantum critical point. Ab initio calculations reveal that Mn-Sb site exchange provides the ferromagnetic interlayer coupling and the slight excess of Mn nearly doubles the Curie temperature. Remaining deviations from the ferromagnetic order open the inverted bulk bandgap and render MnSb2Te4 a robust topological insulator and new benchmark for magnetic topological insulators.

Relationships: Show Relationship Browser for this Object
collection(s): Научное управление
Identifier: смотреть в электронном каталоге НБ ТГУ
Type: статьи в журналах
Source: Advanced materials. 2021. Vol. 33, № 42. P. 2102935 (1-11)
Language: eng

Created: 18-04-2022

4193 Visitors

4137 Hits

214 Downloads

Научное управление Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45-50 K