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We present an experimental study of the magnetic structure and dynamics oftwo frustrated hyperkagome compounds, Gd3Ga5O12 and Gd3Al5O12. It haspreviously been shown that Gd3Ga5O12 exhibits long-range correlations ofmultipolar directors, that are formed from antiferromagnetic spins on loops often ions. Using neutron diffraction and Reverse Monte Carlo simulations weprove the existence of similar magnetic correlations in Gd3Al5O12, showing theubiquity of these complex structures in frustrated hyperkagome materials.  Using inelastic neutron scattering we shed further light on the directorstate and the associated low lying magnetic excitations. In addition we havemeasured quasielastic dynamics that show evidence of spin diffusion. Finally,we present AC susceptibility measurements on both Gd3Ga5O12 and Gd3Al5O12,revealing a large difference in the low frequency dynamics between the twootherwise similar compounds.

Spin dynamics of the director state in frustrated hyperkagome systems