ISIS Neutron and Muon Source Data Journal

Dispersionless spin waves and field-induced magnetic order in Gd3Al5O12

Abstract: Gd3Ga5O12 (GGG) is the archetypal frustrated magnet with unusual short-range order and magnetic excitations. Recently we have found that the dominant contribution to INS in GGG in magnetic field is from a band of almost dispersionless excitations. These correspond to the spin waves localised on ten site rings, expected on the basis of nearest neighbour exchange interaction, and the spectrum is well described by a spin wave theory. We propose to study the homologous compound, Gd3Al5O12 (GAG), with a slightly different ratio of exchange to dipolar interactions, J/D. A specific heat study of GAG shows a broad maximum at 1 K followed by a sharp peak at 175 mK indicative of long range order, unlike GGG which remains disordered. With a different value of J/D the INS study of GAG should allow exploration of the physics of interacting (nearly) dispersionless bosons.

Principal Investigator: Professor Petronella Deen
Experimenter: Professor Kim Lefmann
Experimenter: Mr Joseph Guyon-Le-Bouffy
Experimenter: Dr Christopher Knee
Experimenter: Professor Paul Henry
Experimenter: Dr Oleg Petrenko
Experimenter: Dr Nicholas d'Ambrumenil
Experimenter: Dr Henrik Jacobsen
Local Contact: Dr Rob Bewley

DOI: 10.5286/ISIS.E.RB1520308

ISIS Experiment Number: RB1520308

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Professor Petronella Deen et al; (2015): Dispersionless spin waves and field-induced magnetic order in Gd3Al5O12, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB1520308

Data is released under the CC-BY-4.0 license.