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Defect-Unbinding Transition in Layered Superconductors

Matthew J. W. Dodgson, Vadim B. Geshkenbein, Gianni Blatter

cond-mat.supr-conarXiv:cond-mat/9902244

Abstract

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.

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