Dispersionless Spin Waves and Underlying Field-Induced Magnetic Order in Gadolinium Gallium Garnet.
(2015) In Physical Review Letters 114(22).- Abstract
- We report the results of neutron diffraction and inelastic neutron scattering on a powder sample of Gd_{3}Ga_{5}O_{12} 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... (More)
- We report the results of neutron diffraction and inelastic neutron scattering on a powder sample of Gd_{3}Ga_{5}O_{12} 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7727330
- author
- d'Ambrumenil, N ; Petrenko, O A ; Mutka, H and Deen, Pascale LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 114
- issue
- 22
- article number
- 227203
- publisher
- American Physical Society
- external identifiers
-
- pmid:26196642
- scopus:84935901782
- pmid:26196642
- ISSN
- 1079-7114
- DOI
- 10.1103/PhysRevLett.114.227203
- language
- English
- LU publication?
- yes
- id
- ffaa8162-e44f-4122-820b-ba38799d22a7 (old id 7727330)
- date added to LUP
- 2016-04-01 09:47:32
- date last changed
- 2022-02-17 03:16:24
@article{ffaa8162-e44f-4122-820b-ba38799d22a7,
abstract = {{We report the results of neutron diffraction and inelastic neutron scattering on a powder sample of Gd_{3}Ga_{5}O_{12} 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.}},
author = {{d'Ambrumenil, N and Petrenko, O A and Mutka, H and Deen, Pascale}},
issn = {{1079-7114}},
language = {{eng}},
number = {{22}},
publisher = {{American Physical Society}},
series = {{Physical Review Letters}},
title = {{Dispersionless Spin Waves and Underlying Field-Induced Magnetic Order in Gadolinium Gallium Garnet.}},
url = {{http://dx.doi.org/10.1103/PhysRevLett.114.227203}},
doi = {{10.1103/PhysRevLett.114.227203}},
volume = {{114}},
year = {{2015}},
}