Fig. 10: Evolution of the magnetic excitation spectrum of K2Co(SeO3)2 in the supersolid phase in a magnetic field.
From: Wannier states and spin supersolid physics in the triangular antiferromagnet K2Co(SeO3)2
False-color plots of neutron scattering intensity measured on K2Co(SeO3)2 on the LET spectrometer at T = 50 mK as a function of energy and wave vector along high-symmetry directions of the Brillouin zone in a magnetic field applied along the c axis: a μ0H = 0, b 0.25 T, c 0.5 T, and d 0.75 T. The incident neutron energy is Ei = 2.15 meV, the resolution is 0.04 meV at the elastic line. The data were integrated over ± 0.75 r.l.u. in l and ± 0.05 r.l.u. in the (h, k, 0) plane perpendicular to the cut, and averaged over equivalent paths shown in Supplementary Fig. 4. The spectra measured at 7 T have been subtracted to remove the background from the sample environment. Note that in (d) the residual scattering at the K point near 0.4 meV is due to spurious scattering from the cryomagnet and imperfect background subtraction. Solid lines are the dispersion curves calculated by the linear spin wave theory. Circles are first poles of Szz(q, ω) calculated by QMC. The white hexagon represents the Brillouin zone boundary. Γ, K, and M label high symmetry points in the reciprocal space.
