Resurrection of the Melting Line in the Bose Glass Superconductor

I argue that in contrast to $B<\mathrm{}{B}_{\phi }$, where the vortex liquid (VL) freezes into the strongly pinned Bose glass (SBG) phase, with flux-line vortices localized by the columnar defects, for $B>\mathrm{}{B}_{\phi }$, 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 $B>\mathrm{}{B}_{\phi }$, 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 $B>\mathrm{}{B}_{\phi }$ the true linear superconductor only forms at $T$ well below the $B<\mathrm{}{B}_{\phi }$ irreversibility line.