The question of the nature of the anomalous isotopic effect (AIE) for Tc in the metals PdHx and PdDx is studied. It is shown that when only the anharmonicity in the oscillations of H and D is taken into account, the scale of the AIE cannot be correctly described. It is found that the effective Coulomb and electron–paramagnon interactions play an important role. A specific analysis is carried out based on an approximate solution of the Burke–Schrieffer equation for Tc. In addition to the AIE, the pressure dependence of Tc and the change in AIE accompanying a deviation from the stoichiometric composition are described quantitatively.

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