Abstract
We report specific heat, magnetic, and muon spin relaxation measurements performed on a polycrystalline sample of the normal spinel . The rare-earth ions sit on a lattice of corner-sharing regular tetrahedra as in pyrochlore compounds. Magnetic ordering is detected at K. From spin-lattice relaxation rate measurements on both sides of we uncover similar magnetic excitation modes driving the so-called persistent spin dynamics at . Unidimensional excitations are argued to be at its origin. Often observed spin loop structures are suggested to support these excitations. The possibility of a generic mechanism for their existence is discussed.
1 More- Received 20 November 2013
- Revised 23 December 2014
DOI:https://doi.org/10.1103/PhysRevB.91.104427
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