  The natural bulk van der Waals heterostructures compound 6R-TaS2 consists of
alternate stacking 1T- and 1H-TaS2 monolayers, creating a unique system that
incorporates charge-density-wave (CDW) order and superconductivity (SC) in
distinct monolayers. Here, after confirming that the 2D nature of the lattice
is preserved up to 8 GPa in 6R-TaS2, we documented an unusual evolution of CDW
and SC by conducting highpressure electronic transport measurements. Upon
compression, we observe a gradual suppression of CDW within the 1T-layers,
while the SC exhibits a dome-shaped behavior that terminates at a critical
pressure Pc around 2.9 GPa. By taking account of the fact that the substantial
suppression of SC is concomitant with the complete collapse of CDW order at Pc,
we argue that the 6R-TaS2 behaves like a stack of Josephson junctions and thus
the suppressed superconductivity can be attributed to the weakening of
Josephson coupling associated with the presence of CDW fluctuations in the
1T-layers. Furthermore, the SC reversely enhances above Pc, implying the
development of emergent superconductivity in the 1T-layers after the melting of
T-layer CDW orders. These results show that the 6R-TaS2 not only provides a
promising platform to explore emergent phenomena but also serves as a model
system to study the complex interactions between competing electronic states.
