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  Weyl Nodes Close to the Fermi Energy in NbAs

Naumann, M., Arnold, F., Medvecká, Z., Wu, S.-C., Süss, V., Schmidt, M., et al. (2021). Weyl Nodes Close to the Fermi Energy in NbAs. Physica Status Solidi B, 2100165, pp. 1-7. doi:10.1002/pssb.202100165.

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 Creators:
Naumann, Marcel1, Author              
Arnold, Frank1, Author              
Medvecká, Zuzana1, Author              
Wu, Shu-Chun2, Author              
Süss, Vicky2, Author              
Schmidt, Marcus3, Author              
Yan, Binghai4, Author
Huber , Nico4, Author
Worch, Lukas4, Author
Wilde, Marc A.4, Author
Felser, Claudia5, Author              
Sun, Yan2, Author              
Hassinger, Elena1, Author              
Affiliations:
1Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_2466700              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              
4External Organizations, ou_persistent22              
5Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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Free keywords: Arsenic compounds; Density functional theory; Fermi surface; Fruits; Niobium compounds; Tantalum compounds; Topology; Transition metals, Magnetic torques; Magnetoelectric response; Measurements of; Momentum spaces; Non-centrosymmetric; Quantum oscillations; Singular points; Topological charges, Phosphorus compounds
 Abstract: The noncentrosymmetric transition-metal monopnictides NbP, TaP, NbAs, and TaAs are a family of Weyl semimetals in which pairs of protected linear crossings of spin-resolved bands occur. These so-called Weyl nodes are characterized by integer topological charges of opposite sign associated with singular points of Berry curvature in momentum space. In such a system, anomalous magnetoelectric responses are predicted, which should only occur if the crossing points are close to the Fermi level and enclosed by Fermi surface pockets penetrated by an integer flux of Berry curvature, dubbed Weyl pockets. TaAs is shown to possess Weyl pockets, whereas TaP and NbP have trivial pockets enclosing zero net flux of Berry curvature. Herein, via measurements of the magnetic torque, resistivity, and magnetization, a comprehensive quantum-oscillation study of NbAs is presented, the last member of this family where the precise shape and nature of the Fermi surface pockets is still unknown. Seven distinct frequency branches, three of which have not been observed before, are detected. A comparison with density functional theory calculations suggests that the two largest pockets are topologically trivial, whereas the low frequencies might stem from tiny Weyl pockets. The enclosed Weyl nodes are within a few meV of the Fermi energy. © 2021 The Authors. physica status solidi (b) basic solid state physics published by Wiley-VCH GmbH.

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Language(s): eng - English
 Dates: 2021-06-302021-06-30
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1002/pssb.202100165
BibTex Citekey: Naumann2021
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Title: Physica Status Solidi B
  Abbreviation : Phys. Status Solidi B
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: - Sequence Number: 2100165 Start / End Page: 1 - 7 Identifier: ISSN: 0370-1972
CoNE: https://pure.mpg.de/cone/journals/resource/958480240330