"Vortex-melting front" in thin superconductors with pinning

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Magneto-optical observations of a second flux front, which occurs at the second peak in the magnetization of Bi_2 Sr_2 CaCu_2 O_x single crystals related to the known first order ``vortex-lattice melting'', are reconsidered. We show that, in thin samples, electrodynamics necessarily leads to an extended region in which the magnetic induction adopts a nearly constant value close to that at which the phase transition occurs at thermal equilibrium. In this region a dynamical phase mixture of vortex ``solid'' and ``liquid'' should exist. Interestingly, the observed second flux front does not mark the ``melting'' front, as it was naively interpreted earlier, but indicates the disappearance of the last ``solid droplets''.
Summitted to Phys.Rev. B 8.05.2002, resubmitted 23.08.2002; 7 pages, 6 figures

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/19828

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0208468
 http://arxiv.org/abs/cond-mat/0208468

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arXiv