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|Title:||Superconducting properties in arrays of nanostructured beta-gallium|
|Author:||Moura, K. O.|
Pirota, K. R.
Jesus, C. B. R.
Rosa, P. F. S.
Pagliuso, P. G.
Lima, O. F. de
|Abstract:||Samples of nanostructured beta-Ga wires were synthesized by a novel method of metallic-flux nanonucleation. Several superconducting properties were observed, revealing the stabilization of a weak-coupling type-II-like superconductor (T-c approximate to 6.2 K) with a Ginzburg-Landau parameter kappa(GL) = 1.18. This contrasts the type-I superconductivity observed for the majority of Ga phases, including small spheres of beta-Ga with diameters near 15 mu m. Remarkably, our magnetization curves reveal a crossover field H-D, where we propose that the Abrikosov vortices are exactly touching their neighbors inside the Ga nanowires. A phenomenological model is proposed to explain this result by assuming that only a single row of vortices is allowed inside a nanowire under perpendicular applied field, with an appreciable depletion of Cooper pair density at the nanowire edges. These results are expected to shed light on the growing area of superconductivity in nanostructured materials.|
|Subject:||Supercondutores - Materiais|
Superconductors - Materials
|Editor:||Nature Publishing Group|
|Appears in Collections:||IFGW - Artigos e Outros Documentos|
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