Fig. 4: Dynamics at low temperatures.
Measured spectra (points) of the complex permittivity Δε*(ν) at H ≈ Hc with fits of Equation (2) (lines) are shown in a for the real part, \({{\Delta }}\varepsilon ^{\prime}\), and the imaginary part, the dielectric loss Δε″, in b as a function of the frequency ν. The fitted peak frequencies of the maxima in Δε″ are shown in c for both the relaxation (gray squares) and the emergent excitation (blue circles) on the left scale with the corresponding damping factor for the excitation (triangles) on the right scale. The error bars in c correspond to the root mean squared error that was obtained when fitting the spectra with Equation (2).
