Physics – Condensed Matter – Superconductivity
Scientific paper
2008-12-23
Physics
Condensed Matter
Superconductivity
accepted for publication in Phys Rev B
Scientific paper
10.1103/PhysRevB.79.024507
We report measurements of voltage noise due to vortex motion in Niobium, a conventional low-Tc superconductor. A coherent oscillation leading to narrow band noise (NBN) is evidenced. Its characteristic frequency is a linear function of the overcritical transport current in the flux-flow regime, and hence scales as the main velocity of the vortex flow. The associated length scale is not the intervortex distance but the width of the sample, indicating temporal coherence at a large scale. NBN is also observed in the non linear part of the V(I) at the onset of depinning, in apparent disagreement with a stochastic creep motion of flux bundles. NBN exists in the peak effect region, showing that long range temporal correlations are preserved in this regime.
Pautrat Alain
Scola Joseph
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