Figure 4. Double integrated intensity (DIN) of the original ESR spectra for Cu_1-xNMn_3+x.

(a) for x = 0.1 and (b) for x = 0.3. The inverse DIN is also shown in each panel. The solid line (red) on DIN⁻¹(T) curve indicates a linear fit. The temperatures (T^#s) at which DIN⁻¹ departs from the linear dependence on temperature and the Curie temperature T_C are indicated by the arrows.