Physics – Condensed Matter – Superconductivity
Scientific paper
2000-02-01
Solid State Commun. 114, 241 (2000)
Physics
Condensed Matter
Superconductivity
8 pages, 1 Figure
Scientific paper
10.1016/S0038-1098(00)00056-9
In this communication we argue that the Vortex Lattice Melting scenario fails to explain several key experimental results published in the literature. From a careful analysis of these results we conclude that the Flux Line Lattice (FLL) does not melt along a material- and sample-dependent boundary $H_j(T)$ but the opposite, it de-couples from the superconducting matrix becoming more ordered. When the FLL depinning is sharp, the difference between the equilibrium magnetization $M_{eq}(T,H)$ of the pinned and unpinned FLL leads to the observed step-like change $\Delta M_{eq}(T,H)$. We demonstrate that the experimentally obtained $\Delta M_{eq}(T,H)$ can be well accounted for by a variation of the pinning efficiency of vortices along the $H_j(T)$ boundary.
Esquinazi Pablo
Kopelevich Yakov
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