Fig. 4: Dielectric property of 1.

The temperature-dependent dielectric constant measured at different frequencies along the c-axis of crystal 1. Inset: plot of 1/ε′ vs. temperature in the region near Tc that has been fit with the Curie–Weiss law

The temperature-dependent dielectric constant measured at different frequencies along the c-axis of crystal 1. Inset: plot of 1/ε′ vs. temperature in the region near Tc that has been fit with the Curie–Weiss law