The critical magnetic fields for the system PdHx (Dx) have been measured over the interval of superconducting hydrogen (deuterium) concentrations x = 0.77–1.00 at temperatures 0.35–11 K. The transition to the superconducting state was detected simultaneously by the change in resistivity and in the differential magnetic susceptibility. It was shown that PdHx is a type II superconductor for x < 1, but becomes a type I superconductor for x = 1. The coefficient of the electronic specific heat γ was calculated from the measured Hc2(T) dependence according to the formula γ=2.2105ρ1dHc2/dTTc. The critical magnetic field corresponding to the superconducting transition determined by the resistance method was associated with the existence of surface superconductivity.

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