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Mutka, H., Ehlers, G., Payen, C., Bono, D., Stewart, J. R., Fouquet, P., Mendels, P., Mevellec, J. Y., Blanchard, N. & Collin, G. (2006) Neutron spin-echo investigation of slow spin dynamics in kagome-bilayer frustrated magnets as evidence for phonon assisted relaxation in SrCr9xGa12-9xO19. Phys. Rev. Lett. 97 047203.
Added by: Florent Boucher (2016-05-12 13:21:36) |
| Type de référence: Article DOI: 10.1103/PhysRevLett.97.047203 Numéro d'identification (ISBN etc.): 0031-9007 Clé BibTeX: Mutka2006 Voir tous les détails bibliographiques  |
Catégories: INTERNATIONAL, MIOPS Mots-clés: glass, high-resolution, lattice, srcr8ga4o19, systems Créateurs: Blanchard, Bono, Collin, Ehlers, Fouquet, Mendels, Mevellec, Mutka, Payen, Stewart Collection: Phys. Rev. Lett. |
Consultations : 1/457
Indice de consultation : 3% Indice de popularité : 0.75% |
| Résumé |
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A neutron spin-echo investigation of the low temperature spin dynamics in two well-characterized kagome bilayer compounds SrCr9xGa12-9xO19 (x=0.95, SCGO) and Ba2Sn2ZnCr7xGa10-7xO22 (x=0.97, BSZCGO) reveals two novel features. One is the slowing down of the relaxation rate without critical behavior at T-g, where a macroscopic spin-glass-like freezing occurs. The second is, in SCGO at 4 K (approximate to T-g){<} T {<} 7 K, the relaxation rate activation energy E-a=7 +/- 0.4 meV, equal to the energy of a phonon mode, pointing out the role of spin-lattice coupling.
Added by: Florent Boucher |