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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Khuntia, P., Manni, S., Foronda, F. R., Lancaster, T., Blundell, S. J., Gegenwart, P. & Baenitz, M. (2017). Local magnetism and spin dynamics of the frustrated honeycomb rhodate Li2RhO3. Physical Review B 96(9): 094432.

Author(s) from Durham


We reportmagnetization, heat capacity, 7Li nuclear magnetic resonance (NMR), and muon-spin rotation (μSR)
measurements on the honeycomb 4d5 spin liquid candidate Li2RhO3. The magnetization in small magnetic fields
provides evidence of the partial spin-freezing of a small fraction of Rh4+ moments at 6 K, whereas the Curie-Weiss
behavior above 100 K suggests a pseudo-spin-1/2 paramagnet with a moment of about 2.2μB. The magnetic
specific heat (Cm) exhibits no field dependence and demonstrates the absence of long-range magnetic order
down to 0.35 K. Cm/T passes through a broad maximum at about 10 K and Cm ∝ T 2 at low temperatures.
Measurements of the spin-lattice relaxation rate (1/T1) reveal a gapless slowing-down of spin fluctuations upon
cooling with 1/T1 ∼ T 2.2. The results from NMR and μSR are consistent with a scenario in which a minority of
Rh4+ moments are in a short-range correlated frozen state and coexist with a majority of moments in a liquid-like
state that continue to fluctuate at low temperatures.