The temperature $\left(T\right)$ as a function of pressure $\left(P\right)$ phase diagram is reported for the cubic Laves phase compound ${\mathrm{Au}}_2\text{Pb}$, which was recently proposed to support linearly dispersing topological bands, together with conventional quadratic bands. At ambient pressure, ${\mathrm{Au}}_2\text{Pb}$ exhibits several structural phase transitions at $T_1=97\text{K}$, $T_2=51\text{K}$, and $T_3=40\text{K}$ with superconductivity below $T_{\mathrm{c}}=1.2\text{K}$. Applied pressure results in a rich phase diagram where $T_1,T_2$, and $T_3$ evolve strongly with $P$ and a possible new phase is stabilized for $P>0.64$ GPa that also supports superconductivity below 1.1 K. These observations suggest that ${\mathrm{Au}}_2\text{Pb}$ is an ideal system in which to investigate the relationship between structural degrees of freedom, band topology, and resulting anomalous behaviors.

• Received 6 October 2015

DOI:https://doi.org/10.1103/PhysRevB.93.045118