We test the quadrupolar Kondo scenario in U0.9Th0.1Be13 by measurements of the non-linear susceptibility. We found our non-linear-susceptibility data to be consistent with a transition below T ∼ 6K from a magnetic (f3) to a quadrupolar (f2) doublet ground state of the U atom.

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The Hall effect for a two-channel Kondo ground state is considered. We show that the Hall coefficient should vanish in the low-magnetic-field limit. We check experimentally this prediction for U0.9Th0.1Be13 where an electric quadrupolar Kondo ground state was recently observed.

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