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Polycrystalline HfPd2Al has been synthesized using the arc-melting method andstudied under ambient pressure conditions by x-ray diffraction from roomtemperature up to 450^oC. High pressure x-ray diffraction up to 23 GPa was alsoperformed using Diacell-type membrane diamond anvil cells. The estimated linearthermal expansion coefficient was found to be {\alpha} = 1.40(3)x10^{-5}K^{-1}, and the bulk modulus derived from the fit to the 3rd orderBirch-Murnaghan EOS (BMEOS) is B0 = 97(2) GPa. Resistivity studies underapplied pressure (p < 7.49 GPa) showed a linear decrease of superconductingcritical temperature with increasing pressure and the slope dTc/dp = -0.13(1) KGPa^{-1}. The same behavior is observed for the electron-phonon couplingconstant {\lambda_{ep}}(p) that changes from 0.67 to 0.6, estimated for p =0.05 GPa and 7.49 GPa, respectively. First principles electronic structure andphonon calculation results are presented and used to estimate the magnitude ofelectron-phonon interaction {\lambda_{ep}} and its evolution with pressure.Theoretical results explain the experimentally observed decrease in Tc due toconsiderable lattice stiffening.

Pressure effects on the superconductivity of HfPd2Al Heusler compound: Experimental and theoretical study