Figure 4: Peak frequency of the dielectric loss spectra.

νp=1/(2πτ) as a function of temperature, T, and internal field Hi=H−DM along the [111] axis. The critical end point temperature is Tc=360 mK. The black and red curve mark νp(T) at zero and critical field; the blue dots mark the positions of full-width at half-maximum (FWHM) of the νp(Hi) curves at different temperatures.