Neutron spin echo study of the spin dynamics of the geometrically frus trated pyrochlore Er2Ti2O7 in the magnetically ordered state.
The geometrically frustrated magnets on a pyrochlore lattice are attracting a lot of attention. In these systems where the magnetic ions sit on a lattice of corner sharing tetrahedra, a large variety of exotic magnetic states is observed. The reason is rooted in the different possible crystal-electric-field anisotropies and the large degeneracy of the ground state energy which is favored by the geometry of the lattice. The actual ground state depends on the balance of several types of magnetic interactions. The compound of interest here is the planar antiferromagnet Er2Ti2O7 which shows magnetic order, but an unexpected dynamical component in the nanosecond time range is inferred by muon spin relaxation measurements deep in the ordered state. This unconventional coexistence of static and dynamical components in the ordered state was previously found for the Ising-like Tb2Sn2O7. In our initial high-resolution measurement on IN11, we have evidenced spin dynamics in the ordered state of Er2Ti2O7 by the neutron spin-echo technique. We now propose to go further into this study to shorter spin-echo times and lower temperatures to complete this study to produce publishable results.
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BERTIN Alexandre; DALMAS DE REOTIER Pierre; FAK Bjorn; FOUQUET Peter and YAOUANC Alain. (2013). Neutron spin echo study of the spin dynamics of the geometrically frus trated pyrochlore Er2Ti2O7 in the magnetically ordered state.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1301
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