Temperature dependence of thermodynamic properties of spinel CuIr2S4

We have investigated the thermodynamic and electrical properties of spinel CuIr2S4. The temperature, T, dependence of the electrical resistivity ρ(T), thermal conductivity, κ(T), and thermoelectric power, S(T), show the abrupt jumps with the relative large hysteresis at a metal-insulator transition temperature TMI∼230K, with decreasing T. The acoustic-Debye model can fit κ(T) in the insulating phase (T