Figure 3
The spin-wave dispersion along selected directions in the magnetic Brillouin zone. We use pseudocubic coordinates, in which the Ti ions no. 1 and 2 are located along the
axis. Panels (a)–(c) show the four branches
of the calculated dispersion (solid curves) and the single branch
which has been fitted onto neutron scattering experiments (dashed curves), Eq. (23) in Ref.
1. The acoustic branches
and
are quasidegenerate, such that away from the zone center no splitting between them can be seen. The optical branches
and
are practically indistinguishable over the entire Brillouin zone. (a) The dispersion along (1,1,1)
. The (1,0,0) [panel (b),
] and (0,0,1) [panel(c),
] directions are also shown.
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