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Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6



Thomas Halloran, Yishu Wang, Kemp Plumb, M. B. Stone, Barry Winn, M. K. Graves-Brook, Jose Rodriguez Rivera, Yiming Qiu, Prashant Chauhan, N. Armitage, Tomohiro Takayama, Hidenori Takagi, Collin L. Broholm


Inelastic neutron scattering (INS) measurements of powder D3(7Li)(193Ir)2O6 reveal low energy magnetic excitations with a scattering cross section that is featureless versus |Q| and consistent with a Kitaev spin-liquid (KSL) state. The magnetic nature of the excitation spectrum is demonstrated by polarized neutron studies. The total magnetic moment of 1.7(2)µB/Ir inferred from the total 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 nearest-neighbor Kitaev model with interaction strength K ≈ −10(3) meV. Exchange disorder associated with the mixed D-Li site could play an important role in stabilizing the low T quantum fluctuating state.
Physical Review Letters


Magnetism, Neutron Scattering, Quantum spin liquid, Kitaev spin liquid, Iridates


Halloran, T. , Wang, Y. , Plumb, K. , Stone, M. , Winn, B. , Graves-Brook, M. , Rodriguez Rivera, J. , Qiu, Y. , Chauhan, P. , Armitage, N. , Takayama, T. , Takagi, H. and Broholm, C. (2024), Continuum of magnetic excitations in the Kitaev honeycomb iridate D3LiIr2O6, Physical Review Letters (Accessed April 19, 2024)
Created February 12, 2024, Updated February 15, 2024