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Article Dans Une Revue Physical Review B Année : 2021

Spin dynamics of the director state in frustrated hyperkagome systems

Résumé

We present an experimental study of the magnetic structure and dynamics of two frustrated hyperkagome compounds, Gd3Ga5O12 and Gd3Al5O12. It has previously been shown that Gd3Ga5O12 exhibits long-range correlations of multipolar directors that are formed from antiferromagnetic spins on loops of ten ions. Using neutron diffraction and reverse Monte Carlo simulations we prove the existence of similar magnetic correlations in Gd3Al5O12, showing the ubiquity of these complex structures in frustrated hyperkagome materials. Using inelastic neutron scattering we shed further light on the director state and the associated low-lying magnetic excitations. In addition, we have measured 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 two otherwise similar compounds.
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Dates et versions

hal-03346684 , version 1 (15-11-2021)

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Henrik Jacobsen, Ovidiu Florea, Elsa Lhotel, Kim Lefmann, Oleg A. Petrenko, et al.. Spin dynamics of the director state in frustrated hyperkagome systems. Physical Review B, 2021, 104 (5), pp.054440. ⟨10.1103/PhysRevB.104.054440⟩. ⟨hal-03346684⟩

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