Abstract
We report the structural and electron transport properties of3R-Nb1+xS2 (x⩾0.07) and 3R-GaxNbS2 (0.1⩽x⩽0.33) prepared as polycrystalline pellets as well as singlecrystals grown by vapour transport. We observe a resistance minimumin these compounds between 20 and 60 K, with Tminproportional to x. The resistance scales as ρ/ρmin(T/Tmin) in the range 0.2<T/Tmin<2 fordifferent phases with x⩽0.25 whose resistivity differs by anorder of magnitude. Powder x-ray diffraction also showsprogressively increasing intensity of superlattice lines with cationconcentration. The thermopower changes sign around the resistanceminimum. The explanation of the resistance minimum and thesimultaneous rapid suppression of superconductivity is sought inelectron-electron scattering effects in the presence of cationdisorder in these narrow-band anisotropic materials.
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