High-pressure experimental and theoretical investigations on the fluorite structured compound AuAl{sub 2}

Diamond anvil cell (DAC) based resistance measurements are carried out in AuAl{sub 2} to the pressures of about 25 GPa for the first time. The data indicate possibility of phase transition around 12 GPa. High pressure data obtained using Elettra synchrotron source confirm the transformation of AuAl{sub 2} from ambient CaF{sub 2} to orthorhombic phase. The high precision P-V data when transformed to universal equation of state does not show any deviation from linearity. The first principles electronic band structure calculations up to these pressures in the cubic phase do not reveal any change corroborating the experimental findings of nonobservation of electronic topological transition in this compound.

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