Direct evidence for a dynamical ground state in the highly frustrated Tb2Sn2O7 pyrochlore
F. Bert, P. Mendels, A. Olariu, N. Blanchard, G. Collin, A. Amato, C. Baines, A. D. Hillier
Abstract
MuSR experiments have been performed on powder sample of the "ordered spin ice" Tb2Sn2O7 pyrochlore compound. At base temperature (T=35mK) the muon relaxation is found to be of dynamical nature which demonstrates that strong fluctuations persist below the ferromagnetic transition (TC=0.87K). Hints of long range order appear as oscillations of the muon polarization when an external field is applied and also as a hysteretic behavior below TC. We propose a dynamical and strongly correlated scenario where dynamics results from fluctuation of large spin clusters with the "ordered spin ice" structure.
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