  It is well-known that disordered quantum magnets usually host localized
elementary excitations in gapped phases. Here we show that long-range
magnetodipolar interaction can lead to quasiparticles delocalization in the
three-dimensional case, similarly to the phenomenon previously described for
localized vibrational modes in disordered solids. Employing renormalization
group-like ideas, the average eigenmode occupation number is found to scale
with the system size, which also leads to sub-diffusive dynamical properties of
the system.
