Abstract
We report on ac magnetic susceptibility measurements of the Au-Al-Yb approximant under pressure. It is known that the approximant shows unconventional quantum criticality at the critical pressure Pc ∼ 2 GPa, and further that the magnetic ordered state emerges at a low temperature (Tg ∼ 100 mK) for P > Pc. We nd that the nonlinear susceptibility shows a peak around the temperature Tg at which the linear susceptibility peaks. We also nd that Tg increases with frequency of the modulation eld. From these results, we suggest that the magnetic ordered state of the approximant below Tg is a spin-glass-like short-range ordered state.
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