Fig. 5
From: The nature of spin excitations in the one-third magnetization plateau phase of Ba3CoSb2O9
Excitation spectrum in the UUD phase of Ba3CoSb2O9. a–c Experimental scattering intensity at μ0H = 10.5 T and T = 0.5 K with momentum transfer (a) q = (h, h, −2), (b) q = (1/2, 1/2, l), and (c) q = (1/3, 1/3, l). d–f Calculated transverse part of the scattering intensity, I⊥(q, ω), obtained by NLSW theory along the same momentum cuts as in (a)–(c) for J = 1.74 meV, Δ = 0.85, Jc/J = 0.09, and g⊥ = 3.95. The solid lines show the magnon poles. (g) and (h) Energy dependence of the calculated scattering intensity, Itot(q, ω) (solid line), compared with the experiment for (g) q = (1/3, 1/3, −2) and (h) q = (1/2, 1/2, −2) (error bars represent one standard deviation). The longitudinal contribution to the scattering intensity, \(I_{||}\left( {{\mathbf{q}},\omega } \right)\), is plotted separately as a shaded area. The energy of the outgoing neutrons is Ef = 5 meV (3 meV) above (below) the dashed line in (a–c), (g), and (h)
