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Mutka, H., Payen, C., Bono, D., Ehlers, G., Fouquet, P., Johnson, M. R., Mendels, P., Mevellec, J. Y. & Stewart, J. R. (2007) Phonon-assisted relaxation in a frustrated antiferromagnet. J. Magn. Magn. Mater. 310 1325–1327. 
Added by: Laurent Cournède (2016-03-10 22:02:30)
Type de référence: Article
DOI: 10.1016/j.jmmm.2006.10.848
Numéro d'identification (ISBN etc.): 0304-8853
Clé BibTeX: Mutka2007a
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Catégories: MIOPS
Mots-clés: dynamics, frustration, neutron, neutron spin-echo, slow dynamics, spin
Créateurs: Bono, Ehlers, Fouquet, Johnson, Mendels, Mevellec, Mutka, Payen, Stewart
Collection: J. Magn. Magn. Mater.
Consultations : 13/724
Indice de consultation : 4%
Indice de popularité : 1%
Résumé     
A thermally activated magnetic relaxation is observed using neutron spin-echo in the pyrochlore slab (kagome bilayer) compound SrCr9xGa12-9xO19 (x = 0.95) in a restricted temperature range, 4 K {<} T {<} 7 K, above a cross-over to a low temperature relaxation regime with a weaker temperature dependence. The activation energy of the thermally activated relaxation, of the order of 7 meV, coincides with the energy of a phonon mode observed with neutron and Raman spectroscopy, indicating a phonon-assisted regime. The experimental observation of phonon-assisted process gives additional insight to the importance of spin-phonon coupling in frustrated magnets with regard to the models mostly based on purely magnetic interactions. (c) 2006 Elsevier B.V. All rights reserved.
Added by: Laurent Cournède  
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