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  2D-Berry-Curvature-Driven Large Anomalous Hall Effect in Layered Topological Nodal-Line MnAlGe

Guin, S. N., Xu, Q., Kumar, N., Kung, H.-H., Dufresne, S., Le, C., et al. (2021). 2D-Berry-Curvature-Driven Large Anomalous Hall Effect in Layered Topological Nodal-Line MnAlGe. Advanced Materials, 33(21): 2006301, pp. 1-8. doi:10.1002/adma.202006301.

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Guin, Satya N.1, Author              
Xu, Qiunan1, Author              
Kumar, Nitesh1, Author              
Kung , Hsiang-Hsi2, Author
Dufresne, Sydney2, Author
Le, Congcong1, Author              
Vir, Praveen1, Author              
Michiardi, Matteo1, Author              
Pedersen, Tor2, Author
Gorovikov, Sergey2, Author
Zhdanovich, Sergey2, Author
Manna, Kaustuv1, Author              
Auffermann, Gudrun3, Author              
Schnelle, Walter4, Author              
Gooth, Johannes5, Author              
Shekhar, Chandra6, Author              
Damascelli, Andrea2, Author
Sun, Yan1, Author              
Felser, Claudia7, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Gudrun Auffermann, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863432              
4Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863441              
5Nanostructured Quantum Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_3018212              
6Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
7Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: anomalous Hall effect, Berry curvature, topological nodal-line MnAlGe, Ferromagnetic materials, Ferromagnetism, Fruits, Germanium compounds, Magnetization, Magnets, Manganese, Quantum chemistry, Topology, Anomalous hall effects, Atomic arrangement, Curvature distributions, Hall conductivity, Magnetic layers, Nonmagnetics, Quantum transport devices, Topological properties, Aluminum compounds
 Abstract: Topological magnets comprising 2D magnetic layers with Curie temperatures (TC) exceeding room temperature are key for dissipationless quantum transport devices. However, the identification of a material with 2D ferromagnetic planes that exhibits an out-of-plane-magnetization remains a challenge. This study reports a ferromagnetic, topological, nodal-line, and semimetal MnAlGe composed of square-net Mn layers that are separated by nonmagnetic Al–Ge spacers. The 2D ferromagnetic Mn layers exhibit an out-of-plane magnetization below TC ≈ 503 K. Density functional calculations demonstrate that 2D arrays of Mn atoms control the electrical, magnetic, and therefore topological properties in MnAlGe. The unique 2D distribution of the Berry curvature resembles the 2D Fermi surface of the bands that form the topological nodal line near the Fermi energy. A large anomalous Hall conductivity of ≈700 S cm–1 is obtained at 2 K and related to this nodal-line-induced 2D Berry curvature distribution. The high transition temperature, large anisotropic out-of-plane magnetism, and natural heterostructure-type atomic arrangements consisting of magnetic Mn and nonmagnetic Al/Ge elements render nodal-line MnAlGe one of the few, unique, and layered topological ferromagnets that have ever been observed. © 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH

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Language(s): eng - English
 Dates: 2021-03-182021-03-18
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/adma.202006301
 Degree: -

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Title: Advanced Materials
  Other : Adv. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 33 (21) Sequence Number: 2006301 Start / End Page: 1 - 8 Identifier: ISSN: 0935-9648
CoNE: https://pure.mpg.de/cone/journals/resource/954925570855