Anomalous dielectric response in the dimer Mott insulator $\kappa$-(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$

Majed Abdel-Jawad, Ichiro Terasaki, Takahiko Sasaki +4

We have measured and analyzed the dielectric constant of the dimer Mott insulator $\kappa -$(BEDT-TTF)${}_2$Cu${}_2$(CN)${}_3$, which is known as a playground for a spin-liquid state. Most une…