Abstract
We have measured the magnetization of the heavy fermion compound CeRu2Si2at temperatures down to 300 μK. We observed that the dc-magnetic susceptibility had the plateau due to the Pauli susceptibility between 50 mK and 2 K, and the upturn from this plateau toward lower temperatures. This excess susceptibility shows a Curie- Weiss behavior with a slight signature of saturation at the lowest temperature. This fact indicates that CeRu2Si2has the small residual magnetic moments in its ground state.
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