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We report on ac magnetic susceptibility measurements under pressure of theAu-Al-Yb alloy, a crystalline approximant to the icosahedral quasicrystal thatshows unconventional quantum criticality. In describing the susceptibility as$\chi(T)^{-1} - \chi(0)^{-1} \propto T^{\gamma}$, we find that $\chi(0)^{-1}$decreases with increasing pressure and vanishes to zero at the criticalpressure $P_{\rm c} \simeq 2$ GPa, with $\gamma~ (\simeq 0.5)$ unchanged. Wesuggest that this quantum criticality emerges owing to critical valencefluctuations. Above $P_{\rm c}$, the approximant undergoes a magnetictransition at $T \simeq 100$ mK. These results are contrasted with the factthat, in the quasicrystal, the quantum criticality is robust against theapplication of pressure. The applicability of the so-called $T/H$ scaling tothe approximant is also discussed.

Pressure-Driven Quantum Criticality and T/H Scaling in the Icosahedral Au-Al-Yb Approximant