Transport properties of the quasi-one-dimensional crystal Nb4Te17I4

We report an investigation of the transport properties of the quasi-one-dim ensional crystals Nb4Te17I4, and we compare them with the properties of(NbS e4)(3)I which has more regular structure in the chain direction. Electrical resistivity at room temperature is rho=5 nm, and no transition was observe d in the range 100K<T<340K. By lowering temperature rho(T) follows an activ ation law. Thermal conductivity kappa(T) shows an exponential behavior at l ow temperatures. By increasing temperature around 180K the measured thermal conductivity is very closed to the minimum possible thermal conductivity f or this system.