ИСТИНА

The researching of magnetization from temperature T and magnetic field in Bi2Fe0.128Te2.844Se0.145 single -crystal showed that it have spinglass-like state with freezing temperature T_f = 40 K. It's electric resistivity up to 100 K is ~10^3 Ohm x cm and decreases with the temperature increase. At T> 120 K electric resisitivily ~ 10^(-2)Ohm x cm and magnetization is four orders small than in spiglass-like state. It can be assumed from these results that this sample is topological insulator at T > 120 K and at small temperature, where it is spinglass-like, the breaking of the time reversal symmetry offers.