Narrow-band noise due to the moving vortex lattice in superconducting niobium

Alain Pautrat; Joseph Scola

doi:10.1103/PhysRevB.79.024507

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Narrow-band noise due to the moving vortex lattice in superconducting niobium

Alain Pautrat, Joseph Scola

DOI 10.1103/PhysRevB.79.024507 · Physical Review B

T1

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Abstract

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 nonlinear 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.2	Pressure not reported	unknown