2024/06/18 by Flavián, D., Volkov, P. A., Hayashida, S. +4
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)
paper · doi:10.48550/arxiv.2406.12690
Motivated by the recent discovery of dielectric relaxation by quantum critical magnons in Cs2Cu2Mo3O12, we conduct a detailed analysis of its dielectric response and compare it to that in the isostructural compound Rb2Cu2Mo3O12. Measurements in the vicinity of the field-induced magnon softening show that its description in terms of 3D Bose-Einstein condensation of magnons quantum critical point is unaltered by the presence of dielectric relaxation. We also demonstrate the existence of dielectric relaxation anomalies at 19 K in Rb2Cu2Mo3O12 and discuss the implications for the microscopic origin of dielectric activity in two compounds.