Direct evidence for a dynamical ground state in the highly frustrated Tb₂Sn₂O₇ pyrochlore
Bert, F. · Mendels, P. · Olariu, A. · Blanchard, N. · Collin, G. · Amato, A. · Baines, C. · Hillier, A. D.
Original · EN
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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