Low energy phonons in single crystal ZrW${}_2$O${}_8$

R. A. Ewings, A. I. Duff, K. Refson +2

ZrW${}_2$O${}_8$ is the prototypical example of a material exhibiting negative thermal expansion (NTE). It is now widely accepted that in ZrW${}_2$O${}_8$, and in many other framew…