Physics – Condensed Matter – Superconductivity
Scientific paper
2006-01-03
Physics
Condensed Matter
Superconductivity
accepted for publication in PRB
Scientific paper
10.1103/PhysRevB.73.024508
We report on critical currents and voltage noise measurements in Niobium strips in the superconducting state, in the presence of a bulk vortex lattice ($B < B_{C2}$) and in the surface superconducting state ($B_{c2}< B < B_{C3}$). For homogeneous surfaces, the correlation length of the current fluctuations can be associated with the electromagnetic skin depth of vortex superficial instabilities. The modification of the surface state by means of low energy irradiation induces a strong modification of the critical current and of the noise. The appearance of a corner frequency in the spectral domain can be linked with the low wave-vectors of the artificial corrugation. Since this latter occurs only for $B < B_{C2}$, we propose that the long-range interactions allow the correlation length to extend up to values imposed by the surface topography.
Goupil Ch.
Pautrat Alain
Scola Joseph
Simon Ch.
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