D’Ambrumenil, Nicholas, Petrenko, Oleg, Mutka, H. and Deen, P. P. (2015) Dispersionless spin waves and underlying field-induced magnetic order in gadolinium gallium garnet. Physical Review Letters, 114 (22). 227203 . doi:10.1103/PhysRevLett.114.227203

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Abstract

We report the results of neutron diffraction and inelastic neutron scattering on a powder sample of Gd3Ga5O12 at high magnetic fields. Analysis of the diffraction data shows that in high fields (B ≳ 1.8 T) the spins are not fully aligned, but are canted slightly as a result of the dipolar interaction. The magnetic phase for fields ≲1.8 T is characterized by antiferromagnetic peaks at (210) and an incommensurate wave vector. The dominant contribution to inelastic scattering at large momentum transfers is from a band of almost dispersionless excitations. We show that these correspond to the spin waves localized on ten site rings, expected on the basis of nearest neighbor exchange interaction, and that the spectrum at high fields B ≳ 1.8 T is well described by a spin wave theory.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Gadolinium compounds -- Magnetic properties
Journal or Publication Title:	Physical Review Letters
Publisher:	American Physical Society
ISSN:	0031-9007
Official Date:	2 June 2015
Dates:	Date Event 2 June 2015 Published
Volume:	114
Number:	22
Article Number:	227203
DOI:	10.1103/PhysRevLett.114.227203
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Copyright Holders:	American Physical Society

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