 |
 |
|
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 Voir tous les détails bibliographiques  |
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 : 1/578
Indice de consultation : 4% Indice de popularité : 1% |
| 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 |