Direct evidence for a dynamical ground state in the highly frustrated Tb${}_2$Sn${}_2$O${}_7$ pyrochlore

Abstract

MuSR experiments have been performed on powder sample of the "ordered spin ice" Tb${}_2$Sn${}_2$O${}_7$ 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 (T_C=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 T_C. We propose a dynamical and strongly correlated scenario where dynamics results from fluctuation of large spin clusters with the "ordered spin ice" structure.

Submitted to PRL

References in corpus (3)

• Understanding Paramagnetic Spin Correlations in the Spin-Liquid Pyrochlore Tb2Ti2O7
• Magnetic density of states at low energy in geometrically frustrated systems
• $\mu$SR study of the quantum dynamics in the frustrated $S=3/2$ kagome bilayers

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