Spin dynamics and magnetic order in magnetically frustrated Tb2Sn2O7

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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5 pages, 3 figures. To appear in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.127202

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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