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Heat diffusivity of the Mott systems BaCo0.9Ni0.1S2-y and CuIr2S4

The thermal diffusivity D(T), the Seebeck-coefficient S(T) and specific heat capacity c p (T) of BaCo 0.9 Ni 0.1 S 2-y and of CuIr 2 S 4 were investigated in the temperature range 100 K < T < 350 K and in particular through their metal-insulator transition at T MI . We find steps in S(T); D( T) and in the heat conductivity K( T) at T MO = 230 and 228 K, respectively. In particular, for BaCo 0.9 Ni 0.1 S 1.95 , we find a step in K of almost one order of magnitude. Since a large pressure shift had been discovered earlier for BaCo 0.9 Ni 0.1 S 1.9 , these crystals are potential pressure activated heat switches.