A magnon band analysis of GdRu 2 Si 2 in the field-polarized state

Journal article

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.

Authors: Wood, GDA; Stewart, JR; Mayoh, DA; Paddison, JAM; Bouaziz, J

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Nature Research
• Journal: npj Quantum Materials
• Volume: 10
• Issue: 1
• Article number: 39
• Publication date: 2025-04-16
• Acceptance date: 2025-03-23
• DOI: 10.1038/s41535-025-00755-6
• EISSN: 2397-4648
• Language: English