AC electrical conductivity of FeGaInSe$_{4}$

The results of studying frequency and temperature dependences of AC electrical conductivity in FeGaInSe$_{4}$ crystals are presented. It was found in the frequency interval $f$ = 5 $\times$ 10$^{4}$–10$^{6}$ Hz, the regularity $\sigma\propto f^{S}$ (0.1 $\le$ s $\le$ 1.0) holds for electrical conductivity. From the temperuture dependences the activation energies were determined. It is shown that in the FeGaInSe$_{4}$ crystal, the frequency dependence of electrical conductivity can be explained using the multiplet model, which means that the conductivity in these crystals is characterized by a band-hop mechanism.