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@article{1794559,
author = {Wimmer, Stefan and SánchezandBarriga, Jaime and Küppers, Philipp and Ney, Andreas and Schierle, Enrico and Freyse, Friedrich and Caha, Ondřej and Michalička, Jan and Liebmann, Marcus and Primetzhofer, Daniel and Hoffman, Martin and Ernst, Arthur and Otrokov, Mikhail M. and Bihlmayer, Gustav and Weschke, Eugen and Lake, Bella and Chulkov, Evgueni V. and Morgenstern, Markus and Bauer, Günther and Gunther, Gunther and Rader, Oliver},
article_location = {Weinheim},
article_number = {42},
doi = {http://dx.doi.org/10.1002/adma.202102935},
keywords = {magnetic bandgap; magnetic topological insulators; magnetization; MnSb; Te-2; (4); Mn-Sb site exchange; molecular beam epitaxy},
language = {eng},
issn = {0935-9648},
journal = {Advanced Materials},
title = {Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K},
url = {https://doi.org/10.1002/adma.202102935},
volume = {33},
year = {2021}
}
TY - JOUR
ID - 1794559
AU - Wimmer, Stefan - Sánchez-Barriga, Jaime - Küppers, Philipp - Ney, Andreas - Schierle, Enrico - Freyse, Friedrich - Caha, Ondřej - 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 - Gunther, Gunther - Rader, Oliver
PY - 2021
TI - Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K
JF - Advanced Materials
VL - 33
IS - 42
SP - 2102935
EP - 2102935
PB - Wiley-VCH Verlag GmbH
SN - 09359648
KW - magnetic bandgap
KW - magnetic topological insulators
KW - magnetization
KW - MnSb
KW - Te-2
KW - (4)
KW - Mn-Sb site exchange
KW - molecular beam epitaxy
UR - https://doi.org/10.1002/adma.202102935
N2 - 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.
ER -
WIMMER, Stefan, Jaime SÁNCHEZ-BARRIGA, Philipp KÜPPERS, Andreas NEY, Enrico SCHIERLE, Friedrich FREYSE, Ondřej CAHA, Jan MICHALIČKA, Marcus LIEBMANN, Daniel PRIMETZHOFER, Martin HOFFMAN, Arthur ERNST, Mikhail M. OTROKOV, Gustav BIHLMAYER, Eugen WESCHKE, Bella LAKE, Evgueni V. CHULKOV, Markus MORGENSTERN, Günther BAUER, Gunther GUNTHER and Oliver RADER. Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K. \textit{Advanced Materials}. Weinheim: Wiley-VCH Verlag GmbH, 2021, vol.~33, No~42, p.~2102935-2102945. ISSN~0935-9648. Available from: https://dx.doi.org/10.1002/adma.202102935.
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