Direct Observation of Superheating and Supercooling of Vortex Matter using Neutron Diffraction

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We report the first observation of a striking history dependence of the structure function of the vortex matter in the peak effect regime in a Nb single crystal by using small angle neutron scattering combined with {\it in situ} magnetic susceptibility measurements. Metastable phases of vortex matter, supercooled vortex liquid and superheated vortex solid, have been identified. We interpret our results as direct structural evidence for a first-order solid-liquid transition at the peak effect.
13 pages (RevTex), 4 figures (PostScript)

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/16710

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0008353
 http://arxiv.org/abs/cond-mat/0008353

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arXiv