This article analyses the superconducting (SC) properties and phase diagrams across several families of unconventional superconductors, including the copper-oxides, heavy-fermions, organics and the recently discovered iron-pnictides, iron-chalcogenides, and oxybismuthides. All these families are shown to possess two types of SC domes, with lower and higher Tc, both unconventional but with distinct SC and normal states properties. The lower–Tc dome arises with or without a quantum critical point, but not always associated with a non-Fermi liquid (NFL) background. On the other hand, the higher-Tc dome stems from a NFL or strange metal phase. The analysis suggests NFL physics may be a generic route to higher-Tc superconductivity

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