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U doping effects in (Ce1-xUx)NiSn

We have studied (Ce1-xUx)NiSn for 0 less than or equal to x less than or equal to 0.2 to investigate the effects of U doping on the low-temperature anomalies seen in CeNiSn. From resistivity and thermopower results, we conclude that with as small as 1.6% U doping the anomalies disappear. With further increasing U concentrations, the system becomes unstable towards a weakly antiferromagnetic transition. We discuss the effects due to small U doping at low temperatures in the light of chemical pressure effects and Fermi-level tuning.

CeNiSn ; semiconductor ; antiferromagnetic correlations ; energy gap ; thermopower

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