Fig. 5. Determining the exchange Hamiltonian of RPSO through inelastic neutron scattering.

a Experimental dynamical structure factor, $S\text{(}Q,\mathrm{\Delta }E=\hslash \omega {\text{)}}_{\exp }$, measured at 0.08 K with neutrons of incident energy $E_{\mathsf{i}}=1.78$ meV (LET, ISIS). b Powder-averaged and energy-convoluted S(Q, ΔE = ℏω)_calc simulated using linear spin wave theory for the exchange Hamiltonian, ${\mathcal{H}}_{JK\mathrm{\Gamma }{\mathrm{\Gamma }}^{\prime }}$, with J = 0.32 meV, K = − 0.54 meV, Γ = 0.44 meV, and ${\mathrm{\Gamma }}^{\prime }=-0.12$ meV (Solution 1, Table 1). c–f ΔE-integrated cuts (blue circles) fitted to S(Q, ΔE = ℏω)_calc (red lines). Error bars in c–f represent one standard deviation.