An empirical investigation of superconductors near perturbation onsets*

There are several ways to perturb a nonsuperconducting system towards superconductivity. These techniques in include gating, doping, pressurization, and many more. Motivated by recent empirical investigations showing the onset of superconductivity following an idea gas law-like behavior within intercalated compounds, we report similar relations in materials exhibiting superconductivity through other perturbative means. Specifically, scaling laws are revealed when the effects of chemical and physical tuning are examined near the emergence of superconductivity in nonsuperconducting compounds at and above 1 atm. These relations are shown to be independent of conventional naming schemes typically used to characterize a superconductor's physical and chemical properties, like perovskites, iron pnictides, and cuprates, as examples.