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Mutka, H., Payen, C., Ehlers, G., Stewart, J. R., Bono, D. & Mendels, P. (2007) Low-temperature relaxation in kagome bilayer antiferromagnets. J. Phys.-Condes. Matter, 19 145254. 
Added by: Laurent Cournède (2016-03-10 22:02:30)
Type de référence: Article
DOI: 10.1088/0953-8954/14/145254
Numéro d'identification (ISBN etc.): 0953-8984
Clé BibTeX: Mutka2007
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Catégories: MIOPS
Mots-clés: Defects, dilution, glass, high-resolution, lattice, magnetic frustration, neutron, spin dynamics, srcr8ga4o19, system
Créateurs: Bono, Ehlers, Mendels, Mutka, Payen, Stewart
Collection: J. Phys.-Condes. Matter
Consultations : 7/436
Indice de consultation : 2%
Indice de popularité : 0.5%
Résumé     
The pyrochlore slab (kagome bilayer) compounds SrCr9xGa12-9xO19 ( SCGO; x {<} 1) and Ba(2)Sn(2)ZnCr(7)xGa(10-7)xO(22) (BSZCGO; x {<} 1), are frustrated systems with quite similar magnetic properties of the spin S = 3/2 Cr3+ ions. Neutron scattering studies have shown that the two compounds have a completely dynamic magnetic response in a broad temperature range. In both systems the development of short-ranged dynamic correlations leads to a low-T state that can be understood as local clusters with antiferromagnetic character. At liquid He temperatures a partial freezing of the magnetic fluctuations is observed as an increase of the elastic resolved response. A large majority of the magnetic moments remain fluctuating and one also observes a low-energy (long-time) relaxation in the vicinity of the macroscopic freezing. Time and temperature dependence of this relaxation appear system dependent without critical behaviour, and we conclude that the freezing is a consequence of the establishment of a coherent quantum state.
Added by: Laurent Cournède  
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