Vortex-Loop Unbinding and Flux-Line Lattice Melting in Superconductors

Details Vortex-Loop Unbinding and Flux-Line Lattice Melting in Superconductors Vortex-Loop Unbinding and Flux-Line Lattice Melting in Superconductors

1996-06-03

arxiv.org/abs/cond-mat/9606002v1

Physics

Condensed Matter

4 pages, 3 postscript figures

Scientific paper

10.1103/PhysRevLett.77.1592

We study the interplay between a novel vortex-loop unbinding in finite magnetic field at T=T_V and flux-line lattice (FLL) melting at T=T_M 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 T_V > T_M 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 T_V < T_M due to nucleation of ab-plane vortex-loops uncorrelated to flux lines.

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