Journal Article

FZJ-2026-04017

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A magnon band analysis of GdRu2Si2 in the field-polarized state

Wood, G. D. A. (Corresponding author) ; Stewart, J. R. ; Mayoh, D. A. ; Paddison, J. A. M. ; Bouaziz, J.FZJ* ; Tobin, S. M. ; Petrenko, O. A. ; Lees, M. R. ; Manuel, P. ; Staunton, J. B. ; Balakrishnan, G. (Corresponding author)

2025
Nature Publishing Group [London]

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Please use a persistent id in citations: doi:10.1038/s41535-025-00755-6  doi:10.34734/FZJ-2026-04017

Abstract: Understanding the formation of skyrmions in centrosymmetric materials is a problem of fundamental and technological interest. GdRu2Si2 is a candidate material that hosts a variety of multi-Q magnetic phases, including in zero-field. Here, inelastic neutron scattering is used to measure the spin excitations in the field-polarized phase of GdRu2Si2. Linear spin wave theory and a method of interaction invariant path analysis are used to derive a Hamiltonian accounting for the spectra. The Hamiltonian, dominated by bilinear (Ruderman-Kittel-Kasuya-Yosida) Heisenberg exchange, compares favorably to ab initio calculations. Dipolar interactions are a secondary energy scale to consider, with JD.D~ 0.05JRKKY. However, it is shown that in the field-polarized phase the dipolar interactions ‘self screen’ so that their effect is largely suppressed. No specific evidence for higher-order exchange is found. These aspects are discussed in the context of the lower field multi-Q states and the anisotropy of the system.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (PGI-1)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)

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