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The temperature ($T$) as a function of pressure ($P$) phase diagram isreported for the cubic Laves phase compound Au$_2$Pb, which was recentlyproposed to support linearly dispersing "topological" bands, together withconventional quadratic bands. At ambient pressure, Au$_2$Pb exhibits severalstructural phase transitions at $T_1$ $=$ 97 K, $T_2$ $=$ 51 K, and $T_3$ $=$40 K with superconductivity below $T_{\rm{c}}$ $=$ 1.2 K. Applied pressureresults in a rich phase diagram where $T_1$, $T_2$, and $T_3$ evolve stronglywith $P$ and a new phase is stabilized for $P$ $>$ 0.64 GPa that also supportssuperconductivity below 1.1 K. These observations suggest that Au$_2$Pb is anideal system in which to investigate the relationship between structuraldegrees of freedom, band topology, and resulting anomalous behaviors.

Temperature - Pressure phase diagram of the cubic Laves phase Au$_2$Pb