Non-Linear Susceptibility in U 0.9 Th 0.1 Be 13 : Evidence of a Transition from a Paramagnetic to a Quadrupolar Kondo Ground State

Abstract
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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