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A reentrant peak effect is observed through low field ac susceptibility measurements on the weakly pinned flux line lattice in single crystals of 2H-NbSe 2 . The resulting phase diagram of the peak effect is strikingly similar to the theoretically predicted reentrant phase boundary which separates flux lattice and flux liquid phases. The broadening and ultimate disappearance of the peak effect at very low fields is consistent with the predicted crossover to a disordered glassy state in this field regime. [S0031-9007 (96)00374-2]doi:10.1103/physrevlett.76.4600 pmid:10061332 fatcat:424ctdaeqjfptabozimg2ly6v4