This title appears in the Scientific Report :
2021
Please use the identifier:
http://hdl.handle.net/2128/29375 in citations.
Please use the identifier: http://dx.doi.org/10.1002/adma.202102935 in citations.
Mn‐Rich MnSb 2 Te 4 : A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45–50 K
Mn‐Rich MnSb 2 Te 4 : A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45–50 K
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, antiferromag...
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Personal Name(s): | Wimmer, Stefan |
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Sánchez-Barriga, Jaime / Küppers, Philipp / Ney, Andreas / Schierle, Enrico / Freyse, Friedrich / Caha, Ondrej / 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 (Corresponding author) | |
Contributing Institute: |
JARA - HPC; JARA-HPC JARA-FIT; JARA-FIT Quanten-Theorie der Materialien; IAS-1 Quanten-Theorie der Materialien; PGI-1 |
Published in: | Advanced materials, 33 (2021) 42, S. 2102935 |
Imprint: |
Weinheim
Wiley-VCH
2021
|
DOI: |
10.1002/adma.202102935 |
PubMed ID: |
34469013 |
Document Type: |
Journal Article |
Research Program: |
Topological Matter |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1002/adma.202102935 in citations.
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 Néel 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 β ≈ 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. |