Temperature - Pressure phase diagram of the cubic Laves phase Au₂Pb

الأصل · EN

The temperature (T) as a function of pressure (P) phase diagram is reported for the cubic Laves phase compound Au₂Pb, which was recently proposed to support linearly dispersing "topological" bands, together with conventional quadratic bands. At ambient pressure, Au₂Pb exhibits several structural phase transitions at T₁ = 97 K, T₂ = 51 K, and T₃ = 40 K with superconductivity below Tc = 1.2 K. Applied pressure results in a rich phase diagram where T₁, T₂, and T₃ 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 Au₂Pb is an ideal system in which to investigate the relationship between structural degrees of freedom, band topology, and resulting anomalous behaviors.