A magnon band analysis of GdRu2Si2 in the field-polarized state

Abstract Understanding the formation of skyrmions in centrosymmetric materials is a problem of fundamental and technological interest. GdRu 2 Si 2 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 GdRu 2 Si 2 . 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 J D.D ~ 0.05 J RKKY . 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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Publication Details

Journal
npj Quantum Materials
Published
2025-04-15
DOI
https://doi.org/10.1038/s41535-025-00755-6
Citations
1
Primary Topic
Rare-earth and actinide compounds
Type
article
Field-Weighted Citation Impact
1.26

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article

A magnon band analysis of GdRu2Si2 in the field-polarized state

G. Balakrishnan, P. Manuel, M. R. Lees, O. A. Petrenko et al.
1 citations
npj Quantum Materials
Rare-earth and actinide compounds
1.26
article

A magnon band analysis of GdRu2Si2 in the field-polarized state

G. Balakrishnan, P. Manuel, M. R. Lees, O. A. Petrenko, D. A. Mayoh, J. R. Stewart, G. D. A. Wood, Juba Bouaziz, Joseph A. M. Paddison, S. Tobin, J. B. Staunton
article en
1 citations

Abstract

Abstract Understanding the formation of skyrmions in centrosymmetric materials is a problem of fundamental and technological interest. GdRu 2 Si 2 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 GdRu 2 Si 2 . 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 J D.D ~ 0.05 J RKKY . 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.

npj Quantum MaterialsVol. 10(1)
Rutherford Appleton Laboratory (GB), Oak Ridge National Laboratory (US), Australian Nuclear Science and Technology Organisation (AU), Forschungszentrum Jülich (DE), University of Warwick (GB), University of Oxford (GB)
U.S. Department of Energy, Office of Science, Engineering and Physical Sciences Research Council, Science and Technology Facilities Council, Basic Energy Sciences, Oak Ridge National Laboratory
Openalex Percentile: Top 22%
Rare-earth and actinide compounds
1.26
DOIOpen Access PDFOpenAlex
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