Fig. 6: Scattering phase space and scattering rates as a function of phonon frequency.

This is the phase space for different phonon modes of a zig-zag structure EuAgSb and b Eu₂ZnSb₂. The +(-) sign represents three-phonon absorption (emission) phase space. The calculated anharmonic scattering rates for c EuAgSb and d Eu₂ZnSb₂.