Low-temperature phase transition in Tl In $Se_2$ crystals

Özet

Heat capacity, lattice parameter, spectral and temperature dependences of photoconductivity of chained crystal Tl In $Se_2$ have been investigated in this work. For the first time, it has been found that the phase transtion takes plase at temperatures 135 and 184 K in this crystal. The changes of heat capacity, photoconductivity and lattice parameter of Tl In $Se_2$ in the region of phase transition is supposed to be connected with the presence of an incommensurate phase in this crystal.