Physics – Condensed Matter – Superconductivity
Scientific paper
1999-01-13
Phys. Rev. Lett., Vol. 83, 187 (1999);Erratum:83, 1274, (1999)
Physics
Condensed Matter
Superconductivity
4 Pages, 2 Postscript figures
Scientific paper
10.1103/PhysRevLett.83.187
We investigate vortex structure and melting transition in very anisotropic layered superconductors at fields tilted with respect to the c-axis. We show that even a small in-plane field does not homogeneously tilt the vortex lattice but, instead, penetrates inside the superconductor in the form of Josephson vortices (JVs) similar to the Meissner state. At high c-axis magnetic field the phase field of the JV is built up from the phase perturbations created by displacements of pancake vortices. The crossing-lattices ground state leads to linear dependencies of the melting field and melting temperature on the in-plane field, in agreement with recent experimental observations. At small fields stacks of JVs accumulate additional pancake strings creating vortex rows with enhanced density. This mechanism explains the mixed chains-lattice state observed by Bitter decorations.
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