Vortex-Loop Unbinding and Flux-Line Lattice Melting in Superconductors
Abstract
We study the interplay between a novel vortex-loop unbinding in finite magnetic field at T=TV and flux-line lattice (FLL) melting at T=TM in type-II superconductors. The FLL melts due to nucleation of vortex loops parallel to c-axis, connected to flux lines. For moderate anisotropy, phase coherence along c-axis is lost at TV > TM due to an ab-plane vortex-loop unbinding with loops located close to thermal FLL fluctuations. For large anisotropy, phase coherence along c-axis is lost at TV < TM due to nucleation of ab-plane vortex-loops uncorrelated to flux lines.
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