Direct Observation of the Washboard Noise of a Driven Vortex Lattice in a High-Temperature Superconductor,Bi2Sr2CaCu

Abstract

We studied the conduction noise spectrum in the vortex state of a high-temperature superconductor, Bi(2)Sr(2)CaCu(2)O(y), subject to a uniform driving force. Two characteristic features, a broad-band noise (BBN) and a narrow-band noise (NBN), were observed in the vortex-solid phase. The origin of the large BBN was determined to be plastic motion of the vortices, whereas the NBN was found to originate from the washboard modulation of the translational velocity of the driven vortices. We believe this to be the first observation of washboard noise of dc driven vortices in any superconductor.

Location-sensitive measurement of the local fluctuation of driven vortex density inBi2Sr2CaCuMaeda1, Tsuboi2, Abiru3 et al. 2002Phys. Rev. B243140View full textAdd to dashboardCite

“…This is quite different from the time scale of the NBN observed in the conduction noise, which was the washboard noise [18].…”

Nonequilibrium Phase Transitions of Vortex Matter in Three-Dimensional Layered Superconductors

“…In the moving smectic, the short range of the position correlation along the flow direction totally destroys the temporal order of the moving vortices. To the best of our knowledge, the washboard noise, observed recently in both conventional 7 and high-T c superconductors, 8 has never been reported in numerical simulations except in 2D at zero temperature. 21 We believe this to be the first observation of the washboard velocity modulation of driven vortex matter in 3D numerical simulations.…”

“…74.60.Ge,74.50.+r,74.40.+k Dynamical properties of current driven vortex matter 1,2,3 interacting with random pinning potentials in type II superconductors have attracted considerable attention both experimentally 4,5,6,7,8 and theoretically. 9,10,11,12 A better understanding of various nonequilbrium phases and phase transitions is essential for explaining the nonlinear current-voltage (I-V) characteristics observed in experiments conducting on samples in an external magnetic field, 4,13 which is known as the first evidence of the first-order vortex lattice melting.…”

Study of friction using driven vortices of superconductor as a model system

“…For large driving force, vortices move rather uniformly, with a periodic modulation of velocity suffered from the pinning centers (washboard oscillation). This washboard oscillation of driven vortices was observed experimentally [9,10,11]. On the other hand, close to the critical driving force (critical current density, j c ), vortices show a linear resistivity at finite temperatures [12].…”

“…Even restricting our interest on the moving state, various styles of motion have been proposed, indeed, for driven vortices, such as plastic motion [19], moving Bragg glass [17], and smectic motion [16]. We investigated the noise generated by the vortex motion by measuring the local density noise [24,25] and the velocity noise [11] simultaneously [26]. Together with the resistivity data and the ac-dc interference data, we found that the vortices first showed the plastic flow.…”