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  Dirac Magnons, Nodal Lines, and Nodal Plane in Elemental Gadolinium

Scheie, A., Laurell, P., McClarty, P. A., Granroth, G. E., Stone, M. B., Moessner, R., et al. (2022). Dirac Magnons, Nodal Lines, and Nodal Plane in Elemental Gadolinium. Physical Review Letters, 128(9): 097201. doi:10.1103/PhysRevLett.128.097201.

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Scheie, A.1, Author
Laurell, Pontus1, Author
McClarty, Paul A.2, Author           
Granroth, G. E.1, Author
Stone, M. B.1, Author
Moessner, R.1, Author
Nagler, S. E.1, Author
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1external, ou_persistent22              
2Max Planck Institute for the Physics of Complex Systems, Max Planck Society, ou_2117288              

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 Abstract: We investigate the magnetic excitations of elemental gadolinium (Gd) using inelastic neutron scattering, showing that Gd is a Dirac magnon material with nodal lines at K and nodal planes at half integer l. We find an anisotropic intensity winding around the K-point Dirac magnon cone, which is interpreted to indicate Berry phase physics. Using linear spin wave theory calculations, we show the nodal lines have nontrivial Berry phases, and topological surface modes. We also discuss the origin of the nodal plane in terms of a screw-axis symmetry, and introduce a topological invariant characterizing its presence and effect on the scattering intensity. Together, these results indicate a highly nontrivial topology, which is generic to hexagonal close packed ferromagnets. We discuss potential implications for other such systems.

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 Dates: 2022-03-022022-03-04
 Publication Status: Issued
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 128 (9) Sequence Number: 097201 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1