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, Environmental Inorganic Chemistry

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, Environmental Inorganic Chemistry 2

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 054440

Subject Categories

Inorganic Chemistry

Other Physics Topics

Condensed Matter Physics

DOI

10.1103/PhysRevB.104.054440

More information

Latest update

9/9/2021 8