Electrical resistivity and tunneling anomalies in CeCuAs2
  The compound CeCuAs2 is found to exhibit negative temperature (T) coefficient of electrical resistivity (rho) under ambient pressure conditions in the entire T-range of investigation (45 mK to 300 K), even in the presence of high magnetic fields. Preliminary tunneling spectroscopic measurements indicate the existence of a psuedo-gap at least at low temperatures, thereby implying that this compound could be classified as a Kondo semi-conductor, though rho(T) interestingly is not found to be of an activated type. 
E.V. Sampathkumaran, T. Ekino, R.A. Ribeiro, Kausik Sengupta, T.   Nakano, M. Hedo, N. Fujiwara, M. Abliz, Y. Uwatoko, S. Ra...