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Letter. Spin-glass order induced by dynamic frustration

Letter. Spin-glass order induced by dynamic frustration
Letter. Spin-glass order induced by dynamic frustration
Spin glasses are systems whose magnetic moments freeze at low temperature into random orientations without long-range order. It is generally accepted that both frustration and disorder are essential ingredients in all spin glasses, so it was surprising that PrAu2Si2, a stoichiometric compound with a well-ordered crystal structure, was reported to show spin-glass freezing. Here, we report on inelastic neutron scattering measurements of crystal-field excitations, which show that PrAu2Si2 has a singlet ground state and that the exchange coupling is very close to the critical value to induce magnetic order. We propose that spin-glass freezing results from dynamic fluctuations of the crystal-field levels that destabilize the induced moments and frustrate the development of long-range magnetic correlations. This novel mechanism for producing a frustrated ground state could provide a method of testing the concept of 'avoided criticality' in glassy systems.
1745-2473
766-770
Goremychkin, E.A.
37f2b8ac-14dc-4957-9864-b490d9853451
Osborn, R.
12b613a4-baca-43c0-835f-9dc31a5e6a90
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Macaluso, R.T.
97d650bb-8d0f-4579-a20d-33ae2f91430e
Adroja, D.T.
8eaa8fab-9acb-420b-af27-918d6fd01a70
Koza, M.
0328623f-2d1f-47c8-9cbc-d62c2bddef36
Goremychkin, E.A.
37f2b8ac-14dc-4957-9864-b490d9853451
Osborn, R.
12b613a4-baca-43c0-835f-9dc31a5e6a90
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Macaluso, R.T.
97d650bb-8d0f-4579-a20d-33ae2f91430e
Adroja, D.T.
8eaa8fab-9acb-420b-af27-918d6fd01a70
Koza, M.
0328623f-2d1f-47c8-9cbc-d62c2bddef36

Goremychkin, E.A., Osborn, R., Rainford, B.D., Macaluso, R.T., Adroja, D.T. and Koza, M. (2008) Letter. Spin-glass order induced by dynamic frustration. Nature Physics, 4 (10), 766-770. (doi:10.1038/nphys1028).

Record type: Article

Abstract

Spin glasses are systems whose magnetic moments freeze at low temperature into random orientations without long-range order. It is generally accepted that both frustration and disorder are essential ingredients in all spin glasses, so it was surprising that PrAu2Si2, a stoichiometric compound with a well-ordered crystal structure, was reported to show spin-glass freezing. Here, we report on inelastic neutron scattering measurements of crystal-field excitations, which show that PrAu2Si2 has a singlet ground state and that the exchange coupling is very close to the critical value to induce magnetic order. We propose that spin-glass freezing results from dynamic fluctuations of the crystal-field levels that destabilize the induced moments and frustrate the development of long-range magnetic correlations. This novel mechanism for producing a frustrated ground state could provide a method of testing the concept of 'avoided criticality' in glassy systems.

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e-pub ahead of print date: 27 July 2008
Published date: October 2008
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 154939
URI: http://eprints.soton.ac.uk/id/eprint/154939
ISSN: 1745-2473
PURE UUID: 4eaa0cd3-f4fa-4321-9d51-2c3683ef583c

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Date deposited: 26 May 2010 13:52
Last modified: 27 Apr 2022 05:10

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Contributors

Author: E.A. Goremychkin
Author: R. Osborn
Author: B.D. Rainford
Author: R.T. Macaluso
Author: D.T. Adroja
Author: M. Koza

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