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While the layered 122 iron arsenide superconductors are highly anisotropic,unconventional, and exhibit several forms of electronic orders that coexist orcompete with superconductivity in different regions of their phase diagrams, wefind in the absence of iron in the structure that the superconductingcharacteristics of the end member BaPd2As2 are surprisingly conventional. Herewe report on complementary measurements of specific heat, magneticsusceptibility, resistivity measurements, Andreev spectroscopy, and synchrotronhigh pressure x-ray diffraction measurements supplemented with theoreticalcalculations for BaPd2As2. Its superconducting properties are completelyisotropic as demonstrated by the critical fields, which do not depend on thedirection of the applied field. Under the application of high pressure, Tc islinearly suppressed, which is the typical behavior of classical phonon-mediatedsuperconductors with some additional effect of a pressure-induced decrease inthe electronic density of states and the electron-phonon coupling parameters.Structural changes in the layered BaPd2As2 have been studied by means ofangle-dispersive diffraction in a diamond-anvil cell. At 12 GPa and 24.2 GPa weobserved pressure induced lattice distortions manifesting as the discontinuityand, hence discontinuity in the Birch-Murnaghan equation of state. The bulkmodulus is B0=40(6) GPa below 12 GPa and B0=142(3) GPa below 27.2 GPa.

High-pressure effects on isotropic superconductivity in the iron-free layered pnictide superconductor BaPd2As2