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Electrical resistivity and tunneling anomalies in CeCuAs2

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arxiv cond-mat/0408060 v1 pith:DTC2V4ZE submitted 2004-08-03 cond-mat.str-el

E.V. Sampathkumaran , T. Ekino , R.A. Ribeiro , Kausik Sengupta , T. Nakano , M. Hedo , N. Fujiwara , M. Abliz
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Y. Uwatoko S. Rayaprol Th. Doert J.P.F. Jemetio
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classification cond-mat.str-el
keywords cecuas2compoundelectricalfoundresistivitytunnelingactivatedambient
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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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