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Understanding the coexistence, competition and/or cooperation betweensuperconductivity and charge density waves (CDWs) in the transition metaldichalcogenides (TMDs) is an elusive goal which, when realized, promises toreveal fundamental information on this important class of materials. Here, weuse four-terminal current-voltage measurements to study the Van der Waalsinterface between freshly exfoliated flakes of the high-$T_{c}$ superconductor,Bi-2212, and the CDW-dominated TMD layered material, 1T-TaS$_{2}$. For highlytransparent barriers, there is a pronounced Andreev reflection featureproviding evidence for proximity-induced high-$T_{c}$ superconductivity in1T-TaS$_{2}$ with a surprisingly large energy gap ($\sim 20\thinspace $meV)equal to half that of intrinsic Bi-2212 ($\sim 40\thinspace $meV). Oursystematic study using conductance spectroscopy of junctions with differenttransparencies also reveals the presence of two separate boson modes, eachassociated with a "dip-hump" structure. We infer that the proximity-inducedhigh-$T_c$ superconductivity in the 1T-TaS$_2$ is driven by coupling to themetastable metallic phase coexisting within the Mott commensurate CDW (CCDW)phase and associated with a concomitant change of the CCDW order parameter inthe interfacial region.

Bi-2212/1T-TaS$_2$ Van der Waals junctions: Interplay of proximity induced high-$T_c$ superconductivity and CDW order