temperature.[@Strachan; @Strachan2] It has also been proposed that within the vortex liquid there is a sharp first order transition line that splits off from the melting line at higher magnetic fields, and terminates at a critical end point. This transition is claimed to separate regions with lesser vs greater spatial vortex correlations, the more correlated region being called the “vortex slush".[@Worthington; @Shibata] Other works have argued that the disordered vortex state at high magnetic fields continues to exist as a thin sliver of “multidomain glass" all along the vortex melting line, even at low magnetic fields.[@Banerjee; @Menon]

Theoretically, the vortex line phase diagram has been studied within effective elastic theories, often using the Lindemann criterion to estimate the location of melting and other transitions.[@Ertas; @Giamarchi2; @Koshelev; @Kierfeld; @Mikitik; @Kierfeld2] Several of these works[@Kierfeld; @Mikitik; @Kierfeld2] reported the possibility of a critical end point to the vortex lattice melting line at high magnetic fields, as well as a vortex slush phase. However later analytical calculations, based on the Ginzburg-Landau model with pinning,[@LiRosen] and on a vortex line model in a weak impurity background with both elastic and plastic excitations,[@Dietel] found only a unified first order melting transition for the Bragg glass, 