Fig. 2: Single-crystal inelastic neutron scattering results for NCTO.
From: Static magnetic order with strong quantum fluctuations in spin-1/2 honeycomb magnet Na2Co2TeO6
a, b Lowest-energy spin-wave-excitation spectra at 2 K in the magnetic fields of 0 T and 4 T, respectively. The color bars indicate the scattering intensity in a linear scale. The inset shows the elastic neutron scattering plot which is integrated at the elastic location 00 L = [–2.5, 2.5] r.l.u. and E = [–0.075, 0.075] meV at 0 T using a fixed incident energy Ei = 60 meV. The white dash-dotted lines represent the Brillouin zone boundaries. The high symmetry points Γ, K, M, M1 and M2 are marked, and the white arrows show the high symmetry momentum directions Γ-K-M path in the inset. c The constant-Q scans of the K-point (1/3, 1/3, 0) collected at T = 1.5 K by applying magnetic fields up to 4 T along the [−1,1,0] direction. The solid lines represent the fits using a Gaussian function. The error bars are the standard deviation of the inelastic neutron scattering experimental data. The inset shows the field dependence of the FWHM of the excitation gap.
