Phonon-assisted relaxation in a frustrated antiferromagnet
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- 作者：H. Mutka ; C. Payen ; D. Bono ; G. Ehlers ; P. Fouquet ; M.R. Johnson ; P. Mendels ; J.Y. Mevellec ; J.R. Stewart
- 关键词：Frustration ; Slow dynamics ; Neutron spin-echo
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2007
- 出版时间：March 2007
- 年：2007
- 卷：310
- 期：2, Part 2
- 页码：1325-1327
- 全文大小：115 K
文摘
A thermally activated magnetic relaxation is observed using neutron spin-echo in the pyrochlore slab (kagomé bilayer) compound in a restricted temperature range, , 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.