A magnon band analysis of GdRu<sub>2</sub>Si<sub>2</sub> in the field-polarized state

ORAL

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 [1]. 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 [2].

*This paper was financially supported by two Engineering and Physical Sciences Research Council grants: EP/T005963/1, the UK Skyrmion Project, EP/N032128/1 and by the U.K. Research and Innovation and Science and Technology Facilities Council through the provision of beam time at the ISIS Neutron and Muon Source, as well as partial funding for the 160Gd isotope. The work of J. A. M. P. was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.

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Publication: [1] G. D. A. Wood et al., Phys. Rev. B 107, L180402 (2023)
[2] G. D. A. Wood, et al., npj Quantum Materials 10, 39 (2025)

Presenters

  • George Wood

    • ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire, UK

Authors

  • George Wood

    • ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire, UK

  • Ross Stewart

    • ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire, UK

  • Daniel A Mayoh

    • University of Warwick

  • Joseph Paddison

    • Oak Ridge National Laboratory
    • ORNL
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

  • Juba Bouaziz

    • Forschungszentrum Jülich GmbH
    • Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, Jülich, Germany

  • Siobhan M Tobin

    • Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia

  • Oleg A Petrenko

    • Department of Physics, University of Warwick, Coventry, UK

  • Martin R Lees

    • Department of Physics, University of Warwick, Coventry, UK

  • Pascal Manuel

    • STFC Rutherford Appleton Laboratory
    • ISIS Pulsed Neutron Source
    • ISIS Facility, Rutherford Appleton Laboratory
    • ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Oxfordshire, UK
    • ISIS Neutron and Muon Source

  • Julie B Staunton

    • University of Warwick
    • Department of Physics, University of Warwick, Coventry, UK

  • Geetha Balakrishnan

    • University of Warwick
    • Department of Physics, University of Warwick, Coventry, UK