- By:
- Halloran, Thomas; Wang, Yishu; Plumb, Kemp; Stone, Matthew B; Winn, Barry L; Graves-Brook, Melissa K; Rodriguez-Rivera, Jose; Qiu, Yiming; Chauhan, Prashant; Knolle, Johannes; Moessner, Roderich; Armitage, N p; Takayama, Tomohiro; Takagi, Hidenori; Broholm, Collin
- Journal Name:
- npj Quantum Materials
- Page Number:
- 35
- Volume:
- 10
- Issue Number:
- 1
- Publication Date:
- August 25, 2025
- View DOI Listing:
- https://doi.org/10.1038/s41535-025-00748-5
Abstract
Inelastic neutron scattering (INS) measurements of powder D3(7Li)(193Ir)2O6 reveal low energy magnetic excitations with a scattering cross-section that is broad in ∣Q∣ and energy transfer. The magnetic nature of the excitation spectrum is demonstrated by longitudinally polarized neutron scattering. The total magnetic moment of 1.8(4)μB/Ir inferred from the observed magnetic scattering cross-section is consistent with the effective moment inferred from magnetic susceptibility data and expectations for the Jeff = 1/2 single ion state. The rise in the dynamic correlation function S(Q, ω) for ℏω < 5 meV can be described by a simple model assuming nearest-neighbor anisotropic spin exchange, such as that found in the Kitaev model. Exchange disorder associated with the D site likely plays an important role in stabilizing the low T quantum fluctuating state1,2.
