“…In our opinion, the instabilities observed in the electrical conductivity of TlInSe 2 crystals [33][34][35][36][37] are an essential property and are important in understanding the nature of the dielectric response of this compound at low temperatures. This phenomenon has been intensively studied by several research groups, and it has been found that TlInSe 2 exhibits nonlinear effects in electrical behavior in the temperature range below ∼200 K, such as S-shaped current-voltage characteristics, self-excited voltage oscillations in the current-controlled negative differential resistance region and oscillations and jumping in the electrical conductivity [33][34][35][36][37]. The origin of the electrical instabilities in TlInSe 2 has been analyzed in [33,34,47], and it was shown that most probably these effects may be provoked by the dynamic electronic processes in [In 3+ + Se 2− 2 ] − fibers of the crystal.…”