RESURRECTION OF THE MELTING LINE IN THE BOSE GLASS SUPERCONDUCTOR

I argue that in contrast to B<Bφ, where the vortex liquid (VL) freezes into the strongly pinned Bose glass (SBG) phase, with flux-line vortices localized by the columnar defects, for B>Bφ, the additional vortices see a significantly weaker random z-independent potential due to the caging by the vortices strongly pinned on the columnar defects. The result is that for B>Bφ, upon cooling, the VL undergoes a sharp crossover to the interstitial liquid (IL) where the SBG coexists with a resistive liquid of interstitial vortices. At lower T the IL freezes into a distinct weakly pinned Bose glass phase. Therefore for B>Bφ the true linear superconductor only forms at T well below the B<Bφ irreversibility line. © 1995 The American Physical Society.