The Effect of the Fractal Guest Subsystem on the Structure, Heat Capacity and Impedance Response of InSe Crystals Intercalated with Nickel

Abstract

The intercalation compounds of NixInSe (x=0; 0.25; 0.5; 0.75; 1.0; 1.25) were produced by the method of direct synthesis of components in quartz ampoules. These compounds are characterized by the formation of discrete nanoislands from the "guest" component as well as their reproduction with the formation of fractal nets. The inductive response at x=0.25, x=0.75, x=1.25, which for the indicated values of x has different intensity and frequency manifestation has been revealed for these structures. An impedance analysis of electrical current passage and its comparison with the data of temperature dependence of electrical conductivity has been carried out. It was found that the linear contribution to the heat capacity from the electrons at the lowest temperatures disappears as a result of intercalation with nickel, and at temperatures below Debye temperature the temperature dependence of the specific heat does not correspond to the expected law of T2 ÷ 3 for the quasi-twodimensional systems. The revealed out of the ordinary effects can be explained by the change in the fractal structure of the clustered nickel guest subsystem.