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

Abstract

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

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• Dirac semimetal in three dimensions
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Cited by in corpus (6)

• Superconductivity in topologically nontrivial material Au2Pb
• Electronic structure of topological superconductor candidate Au${}_2$Pb
• Superconducting density of states and bandstructure at the surface of the candidate topological superconductor Au2Pb
• Free-carrier dynamics in Au${}_2$Pb probed by optical conductivity measurements
• Surface states in Dirac metals and topological crystalline insulators
• Emergence of Topological Superconductivity in Doped Topological Dirac Semimetals under Symmetry-Lowering Lattice Distortions