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Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K. / Wimmer, Stefan; Sanchez-Barriga, Jaime; Kueppers, Philipp; Ney, Andreas; Schierle, Enrico; Freyse, Friedrich; Caha, Ondrej; Michalicka, Jan; Liebmann, Marcus; Primetzhofer, Daniel; Hoffman, Martin; Ernst, Arthur; Otrokov, Mikhail M.; Bihlmayer, Gustav; Weschke, Eugen; Lake, Bella; Chulkov, Evgueni V.; Morgenstern, Markus; Bauer, Guenther; Springholz, Gunther; Rader, Oliver.

In: Advanced Materials, Vol. 33, No. 42, 2102935, 21.10.2021.

Research output: Contribution to journal › Article › peer-review

Harvard

Wimmer, S, Sanchez-Barriga, J, Kueppers, P, Ney, A, Schierle, E, Freyse, F, Caha, O, Michalicka, J, Liebmann, M, Primetzhofer, D, Hoffman, M, Ernst, A, Otrokov, MM, Bihlmayer, G, Weschke, E, Lake, B, Chulkov, EV, Morgenstern, M, Bauer, G, Springholz, G & Rader, O 2021, 'Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K', Advanced Materials, vol. 33, no. 42, 2102935. https://doi.org/10.1002/adma.202102935

APA

Wimmer, S., Sanchez-Barriga, J., Kueppers, P., Ney, A., Schierle, E., Freyse, F., Caha, O., Michalicka, J., Liebmann, M., Primetzhofer, D., Hoffman, M., Ernst, A., Otrokov, M. M., Bihlmayer, G., Weschke, E., Lake, B., Chulkov, E. V., Morgenstern, M., Bauer, G., ... Rader, O. (2021). Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K. Advanced Materials, 33(42), [2102935]. https://doi.org/10.1002/adma.202102935

Vancouver

Wimmer S, Sanchez-Barriga J, Kueppers P, Ney A, Schierle E, Freyse F et al. Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K. Advanced Materials. 2021 Oct 21;33(42). 2102935. https://doi.org/10.1002/adma.202102935

Author

Wimmer, Stefan ; Sanchez-Barriga, Jaime ; Kueppers, Philipp ; Ney, Andreas ; Schierle, Enrico ; Freyse, Friedrich ; Caha, Ondrej ; Michalicka, Jan ; Liebmann, Marcus ; Primetzhofer, Daniel ; Hoffman, Martin ; Ernst, Arthur ; Otrokov, Mikhail M. ; Bihlmayer, Gustav ; Weschke, Eugen ; Lake, Bella ; Chulkov, Evgueni V. ; Morgenstern, Markus ; Bauer, Guenther ; Springholz, Gunther ; Rader, Oliver. / Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K. In: Advanced Materials. 2021 ; Vol. 33, No. 42.

BibTeX

@article{1a776fb51e654e1bb8deb2d1a96cca0a,
title = "Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K",
abstract = "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.",
keywords = "magnetic bandgap, magnetic topological insulators, magnetization, MnSb, Te-2, (4), Mn-Sb site exchange, molecular beam epitaxy, DIRAC POINT, SEMICONDUCTOR, DISORDER, STATE, MnSb Te, Mn–Sb site exchange, MnSb 2Te 4",
author = "Stefan Wimmer and Jaime Sanchez-Barriga and Philipp Kueppers and Andreas Ney and Enrico Schierle and Friedrich Freyse and Ondrej Caha and Jan Michalicka and Marcus Liebmann and Daniel Primetzhofer and Martin Hoffman and Arthur Ernst and Otrokov, {Mikhail M.} and Gustav Bihlmayer and Eugen Weschke and Bella Lake and Chulkov, {Evgueni V.} and Markus Morgenstern and Guenther Bauer and Gunther Springholz and Oliver Rader",
note = "Publisher Copyright: {\textcopyright} 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH",
year = "2021",
month = oct,
day = "21",
doi = "10.1002/adma.202102935",
language = "English",
volume = "33",
journal = "Advanced Materials",
issn = "0935-9648",
publisher = "Wiley-Blackwell",
number = "42",

}

RIS

TY - JOUR

T1 - Mn-Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45-50 K

AU - Wimmer, Stefan

AU - Sanchez-Barriga, Jaime

AU - Kueppers, Philipp

AU - Ney, Andreas

AU - Schierle, Enrico

AU - Freyse, Friedrich

AU - Caha, Ondrej

AU - Michalicka, Jan

AU - Liebmann, Marcus

AU - Primetzhofer, Daniel

AU - Hoffman, Martin

AU - Ernst, Arthur

AU - Otrokov, Mikhail M.

AU - Bihlmayer, Gustav

AU - Weschke, Eugen

AU - Lake, Bella

AU - Chulkov, Evgueni V.

AU - Morgenstern, Markus

AU - Bauer, Guenther

AU - Springholz, Gunther

AU - Rader, Oliver

N1 - Publisher Copyright: © 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH

PY - 2021/10/21

Y1 - 2021/10/21

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.

AB - 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.

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

KW - DIRAC POINT

KW - SEMICONDUCTOR

KW - DISORDER

KW - STATE

KW - MnSb Te

KW - Mn–Sb site exchange

KW - MnSb 2Te 4

UR - http://www.scopus.com/inward/record.url?scp=85114017779&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/be984a31-06e8-3b10-9a04-06e582eed91c/

U2 - 10.1002/adma.202102935

DO - 10.1002/adma.202102935

M3 - Article

VL - 33

JO - Advanced Materials

JF - Advanced Materials

SN - 0935-9648

IS - 42

M1 - 2102935

ER -

ID: 88189344