Electrical resistivity and tunneling anomalies in CeCuAs2

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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To appear in the proceedings of SCES2004

Scientific paper

10.1016/j.physb.2005.01.005

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.

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