%0 Journal Article %T Defect-Unbinding Transition in Layered Superconductors %A Matthew J. W. Dodgson %A Vadim B. Geshkenbein %A Gianni Blatter %J Physics %D 1999 %I arXiv %R 10.1103/PhysRevLett.83.5358 %X We establish a new interstitial-vacancy unbinding transition of the Berezinskii-Kosterlitz-Thouless type, transforming the three dimensional pancake vortex lattice of a decoupled layered superconductor into a defected solid. This transition is the natural finite-field extension of the vortex-anti-vortex unbinding transition establishing the zero-field superfluid stiffness. At finite Josephson coupling, the defect unbinding transition turns into a topological decoupling transition. %U http://arxiv.org/abs/cond-mat/9902244v1