Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7
P. Dalmas de Reotier, A. Yaouanc, L. Keller, A. Cervellino, B., Roessli, C. Baines, A. Forget, C. Vaju, P.C.M. Gubbens, A. Amato, P.J.C. King
TL;DR
This study investigates the spin dynamics and magnetic order in the geometrically frustrated Tb2Sn2O7, revealing a dynamic ground state with fluctuating magnetic moments and field-dependent magnetic excitations.
Contribution
It provides new insights into the dynamical nature of the magnetic ground state in Tb2Sn2O7 using muon spin relaxation, contrasting with static order evidence from neutron scattering.
Findings
No static magnetic order detected by muon spin relaxation.
Magnetic moments fluctuate with a characteristic time of ~10^{-10} s.
Magnetic field enhances low-energy collective excitations.
Abstract
We report a study of the geometrically frustrated magnetic material Tb2Sn2O7 by the positive muon spin relaxation technique. No signature of a static magnetically ordered state is detected while neutron magnetic reflections are observed in agreement with a published report. This is explained by the dynamical nature of the ground state of Tb2Sn2O7: the Tb3+ magnetic moment characteristic fluctuation time is ~ 10^{-10} s. The strong effect of the magnetic field on the muon spin-lattice relaxation rate at low fields indicates a large field-induced increase of the magnetic density of states of the collective excitations at low energy.
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