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We introduce a McMillan-Ginzburg-Landau theory to describe the cooperativecoexistence of charge-density and superconducting order in two-dimensionalcrystals. With a free-energy that explicitly accounts for the competitionbetween commensurate and incommensurate ground states, we are able to map thetransition between these phases and monitor the development ofdiscommensurations in the near-commensurate regime. Attributing the enhancementof superconducting order to density-wave fluctuations, we propose a couplingscheme that yields a phase diagram in qualitative agreement with experiments inconducting transition metal dichalcogenides. The model predicts the developmentof non-uniform superconductivity similar to that arising from a pair-densitywave, with a spatial texture driven by the underlying charge-density wavefluctuations.

Discommensuration-enhanced superconductivity in the charge density wave phases of transition-metal dichalcogenides