Regensburg 2019 – wissenschaftliches Programm
MA 6.7: Vortrag
Montag, 1. April 2019, 16:30–16:45, Theater
Giant magneto-elastic effect in d2 pyrochlores and the formation of a spin-lattice liquid — •Andrew Smerald1 and George Jackeli1,2 — 1Max Planck Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart — 2Insitute for Functional Matter and Quantum Technologies, University of Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart
We discuss the idea of a giant magneto-elastic effect in frustrated magnets, and suggest that this may provide a good way to understand d2 pyrochlore systems such as Y2Mo2O7. We define magneto-elastic coupling as “giant” when it selects low-temperature spin configurations that are completely unexpected from the point of view of a pure spin model. This can be contrasted with the more usual case in which magneto-elastic coupling selects one or more of the otherwise extensively degenerate ground states of a frustrated magnet. In the case of Y2Mo2O7 we propose that this mechanism results in a classical spin-lattice liquid at intermediate temperatures, in which spin and lattice degrees of freedom are intimately coupled together.