Magnon spectrum of the Weyl semimetal half-Heusler compound GdPtBi

A. S. Sukhanov, Y. A. Onykiienko, R. Bewley, C. Shekhar, C. Felser, and D. S. Inosov
Phys. Rev. B 101, 014417 – Published 14 January 2020

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=(121212) fcc antiferromagnet in the absence of a symmetry-breaking magnetic field. The magnon dispersion reaches an energy of 1.1meV and features a gap of 0.15meV. 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 (121212) phase and is dominated by second-neighbor interactions, thus featuring low frustration.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Received 28 October 2019

DOI:https://doi.org/10.1103/PhysRevB.101.014417

©2020 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. S. Sukhanov1,2,*, Y. A. Onykiienko2, R. Bewley3, C. Shekhar1, C. Felser1, and D. S. Inosov2

  • 1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
  • 2Institut für Festkörper- und Materialphysik, Technische Universität Dresden, D-01069 Dresden, Germany
  • 3ISIS Facility, STFC, Rutherford Appleton Laboratory, Didcot, Oxfordshire OX11 0QX, United Kingdom

  • *alexandr.sukhanov@cpfs.mpg.de

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 101, Iss. 1 — 1 January 2020

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×