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  Magnon spectrum of the Weyl semimetal half-Heusler compound GdPtBi

Sukhanov, A. S., Onykiienko, Y. A., Bewley, R., Shekhar, C., Felser, C., & Inosov, D. S. (2020). Magnon spectrum of the Weyl semimetal half-Heusler compound GdPtBi. Physical Review B, 101(1): 014417, pp. 1-8. doi:10.1103/PhysRevB.101.014417.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-9812-B Version Permalink: http://hdl.handle.net/21.11116/0000-0005-9E94-2
Genre: Journal Article

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 Creators:
Sukhanov, A. S.1, Author              
Onykiienko, Y. A.2, Author
Bewley, R.2, Author
Shekhar, C.3, Author              
Felser, C.4, Author              
Inosov, D. S.2, Author
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: The compound GdPtBi is known as a material where the nontrivial topology of electronic bands interplays with an antiferromagnetic order, which leads to the emergence of many interesting magnetotransport phenomena. Although the magnetic structure of the compound was previously reliably determined, the magnetic interactions responsible for this type of order have remained controversial. In the present study, we employed time-of-flight inelastic neutron scattering to map out the low-temperature spectrum of spin excitations in single-crystalline GdPtBi. The observed spectra reveal two spectrally sharp dispersive spin-wave modes, which reflects the multidomain state of the k = (1/2 1/2 1/2) fcc antiferromagnet in the absence of a symmetry-breaking magnetic field. The magnon dispersion reaches an energy of similar to 1.1 meV and features a gap of similar to 0.15 meV. Using linear spin-wave theory, we determine the main magnetic microscopic parameters of the compound that provide good agreement between the simulated spectra and the experimental data. We show that GdPtBi is well within the q phase and is dominated by second-neighbor interactions, thus featuring low frustration.

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Language(s): eng - English
 Dates: 2020-01-142020-01-14
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 101 (1) Sequence Number: 014417 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008