Spin dynamics of the director state in frustrated hyperkagome systems
Journal article, 2021
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.
Author
Henrik Jacobsen
University of Copenhagen
European Spallation Source (ESS)
Paul Scherrer Institut
University of Oxford
Ovidiu Florea
Grenoble Alpes University
Centre national de la recherche scientifique (CNRS)
Elsa Lhotel
Grenoble Alpes University
Centre national de la recherche scientifique (CNRS)
Kim Lefmann
University of Copenhagen
Oleg A. Petrenko
The University of Warwick
Christopher Knee
Chalmers, Chemistry and Chemical Engineering, Energy and Material
ESAB
Tilo Seydel
Institut Laue-Langevin
Paul Henry
Uppsala University
European Spallation Source (ESS)
STFC Rutherford Appleton Laboratory
Chalmers, Chemistry and Chemical Engineering, Energy and Material
Robert Bewley
STFC Rutherford Appleton Laboratory
David Voneshen
STFC Rutherford Appleton Laboratory
Royal Holloway University of London
Andrew Wildes
Institut Laue-Langevin
Goran Nilsen
STFC Rutherford Appleton Laboratory
Institut Laue-Langevin
Pascale P. Deen
University of Copenhagen
European Spallation Source (ESS)
Physical Review B
2469-9950 (ISSN) 2469-9969 (eISSN)
Vol. 104 5 054440Subject Categories
Inorganic Chemistry
Other Physics Topics
Condensed Matter Physics
DOI
10.1103/PhysRevB.104.054440