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

Autor: Guin SN; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Xu Q; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Kumar N; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Kung HH; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany.; Quantum Matter Institute, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada., Dufresne S; Quantum Matter Institute, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada., Le C; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Vir P; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Michiardi M; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany.; Quantum Matter Institute, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada., Pedersen T; Canadian Light Source, Inc., 44 Innovation Boulevard, Saskatoon, SK, S7N 2V3, Canada., Gorovikov S; Canadian Light Source, Inc., 44 Innovation Boulevard, Saskatoon, SK, S7N 2V3, Canada., Zhdanovich S; Quantum Matter Institute, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada., Manna K; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Auffermann G; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Schnelle W; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Gooth J; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Shekhar C; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Damascelli A; Quantum Matter Institute, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada., Sun Y; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany., Felser C; Department of Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Dresden, 01187, Germany.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2021 May; Vol. 33 (21), pp. e2006301. Date of Electronic Publication: 2021 Mar 18.
DOI: 10.1002/adma.202006301
Abstrakt: 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  ≈ 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.)
Databáze: MEDLINE
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