Phys Rev Lett. 2006 Jul 28;97(4):047203. Epub 2006 Jul 28.

Neutron spin-echo investigation of slow spin dynamics in kagomé-bilayer frustrated magnets as evidence for phonon assisted relaxation in SrCr9xGa12-9xO19.

Mutka H, Ehlers G, Payen C, Bono D, Stewart JR, Fouquet P, Mendels P, Mevellec JY, Blanchard N, Collin G.

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Institut Laue-Langevin, Boîte Postale 156X, F-38042 Grenoble Cedex 9, France. mutka@ill.fr

Abstract

A neutron spin-echo investigation of the low temperature spin dynamics in two well-characterized kagomé 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 Tg, where a macroscopic spin-glass-like freezing occurs. The second is, in SCGO at 4 K (approximately Tg)<T<7 K, the relaxation rate activation energy Ea=7+/-0.4 meV, equal to the energy of a phonon mode, pointing out the role of spin-lattice coupling.

PMID:: 16907610; [PubMed]

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Neutron spin-echo investigation of slow spin dynamics in kagomé-bilayer frustrat...
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Neutron spin-echo investigation of slow spin dynamics in kagomé-bilayer frustrated magnets as evidence for phonon assisted relaxation in SrCr9xGa12-9xO19.

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