Journal
ADVANCED MATERIALS
Volume 33, Issue 21, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202006301
Keywords
anomalous Hall effect; Berry curvature; topological nodal‐ line MnAlGe
Categories
Funding
- ERC [742068TOPMAT]
- Deutsche Forschungsgemeinschaft DFG [247310070, SFB 1143]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat (EXC 2147) [39085490]
- Alexander von Humboldt Foundation
- Max Planck-UBC-UTokyo Centre for Quantum Materials
- Canada Research Chairs Program
- Canada Foundation for Innovation (CFI)
- British Columbia Knowledge Development Fund (BCKDF)
- CIFAR Quantum Materials Program
- CFI
- NSERC
- National Research Council (NRC)
- Canadian Institutes of Health Research (CIHR)
- Government of Saskatchewan
- University of Saskatchewan
- Projekt DEAL
- Canada First Research Excellence Fund, Quantum Materials and Future Technologies Program
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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MnAlGe is a unique topological magnet with 2D ferromagnetic layers, nodal-line semimetal properties, and an out-of-plane magnetization at room temperature; the unique 2D distribution of Mn atoms controls its electrical, magnetic, and topological properties.
Topological magnets comprising 2D magnetic layers with Curie temperatures (T-C) 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 T-C approximate to 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 approximate to 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.
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