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

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

2000-08-24

arxiv.org/abs/cond-mat/0008353v1

Physics

Condensed Matter

Superconductivity

13 pages (RevTex), 4 figures (PostScript)

Scientific paper

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.

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