Title: Evolution of the Structural Transition and Charge Order in SrAl4 Under Pressure
Abstract: Compounds with the tetragonal BaAl4-type crystal structure host a wide variety of complex behavior, including superconductivity, charge-order, and topological phases. SrAl4 shows charge-density wave order at TCDW = 243 K and a hysteretic structural transition at T* ~ 85 K. Recent investigations have shown these transitions to be very sensitive to chemical substitution. Furthermore, strain measurements have hinted at possible nematic order, which could provide a path to superconductivity, much like in the (Ba,Sr)Ni2As2 system. Another avenue to tune the electronic structure of these correlated systems is the application of pressure. In this talk, we will review the impact of chemical substitution and strain on SrAl4 and present new resistivity data under hydrostatic pressure. We report a decrease in TCDW and suppression of the structural transition hysteresis with increased pressure.