Low-temperature electrical conductivity and dielectric properties of TlInS2(1-x)Se2x crystals

The electrical conductivity, dielectric loss tangent, and permittivity of TlInS2 and TlInS2(1-x)Se2x (x = 0.1, 0.2, 0.3) crystals were measured in the temperature range 100-250 K. Around the incommensurate commensurate phase transition, the temperature dependences show anomalies whose shape and position depend on Se content. With increasing x, the transition temperature decreases sharply, and the anomalies become broader and nearly vanish at x = 0.3. The properties studied exhibit hysteretic behavior in cooling-heating cycles.