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How the two dimensional (2D) quantum Wigner crystal (WC) transforms into themetallic liquid phase remains to be an outstanding problem in physics. Intheories considering the 2D WC to liquid transition in the clean limit, it wassuggested that a number of intermediate phases might exist. We have studied thetransformation between the metallic fluid phase and the low magnetic fieldreentrant insulating phase (RIP) which was interpreted as due to WC formation[Qiu et al, PRL 108, 106404 (2012)], in a strongly correlated 2D hole systemwith large interaction parameter $r_s$ ($\sim~$20-30) and high mobility.Instead of a sharp transition, we found that increasing density (or lowering$r_s$) drives the RIP into a state where the incipient RIP coexists with Fermiliquid. This apparent mixture phase intermediate between Fermi liquid and WCalso exhibits a non-trivial temperature dependent resistivity behavior whichmay be qualitatively understood by the reversed melting of WC in the mixture,in analogy to the Pomeranchuk effect in the solid-liquid mixture of Helium-3.

Evidence for a New Intermediate Phase in a Strongly Correlated 2D System near Wigner Crystallization