Dielectric relaxation in the quantum multiferroics Rb${}_2$Cu${}_2$Mo${}_3$O${}_{12}$ and Cs${}_2$Cu${}_2$Mo${}_3$O${}_{12}$

D. Flavián, P. A. Volkov, S. Hayashida +4

Motivated by the recent discovery of dielectric relaxation by quantum critical magnons in Cs${}_2$Cu${}_2$Mo${}_3$O${}_{12}$, we conduct a detailed analysis of its dielectric response and…