Vortex motion and Josephson effect in superconducting microbridges in

Nivelle, M.J.M.E. de; Aarnink, W.A.M.; Pedyash, M.V.; Reuvekamp, E.M.C.M.; Terpstra, David E.; Verhoeven, M.A.J.; Gerritsma, G.J.; Rogalla, Horst

doi:10.1109/77.233967

Cited by 4 publications

(2 citation statements)

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“…3(c) and (d), together with w = 300 (140) rim, d= 20 nm and ~~ ~~ 2.5 nm, yields q ~ 2.2 ( 1.1 ) × 10-lO kg/ms. This is almost the same value as we determined earlier, from the steps in the I-dV/dI characteristics of a small bridge in a ( 105 ) oriented YBaECU307_6 film [23 ]. These steps could be attributed to the activation of additional paths, along which vortices could cross the bridge.…”

Section: Discussion Of the Measurementssupporting

confidence: 73%

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Coherent vortex motion in YBa2Cu3O7-δ nanobridges prepared by a substrate-etching technique

Nivelle

Gerritsma

Rogalla

1994

Physica C: Superconductivity

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Nanobridges with widths down to 140 nm and lengths of about 250 nm were structured in a 25 nm YBa2CuaOT_a thin film, by means of a substrate-etching technique. At low temperatures, the current-voltage characteristics of these bridges show clear signs of periodic single-vortex motion. A quantitative comparison could be made with a vortex-flow model, which describes the forces acting on the vortices inside a hyperbolically shaped nanobridge, with dimensions much smaller than the thin film magnetic-penetration depth. It follows that the related viscous drag coefficient ~/is approximately I. 0 × 10-to kg/ms and the penetration depth is approximately 4 ttm. These values indicate that the transport properties are dominated by the weak-link behaviour of grain boundaries or twin boundaries in the thin film.

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Section: Discussion Of the Measurementssupporting

confidence: 73%

“…At this moment there are still rather few reports on high-To thin films which are structured in a controllable way to dimensions well below 1 lam [6][7][8][17][18][19][20][21][22][23][24].…”

Section: Preparationmentioning

confidence: 99%

Coherent vortex motion in YBa2Cu3O7-δ nanobridges prepared by a substrate-etching technique

Nivelle

Gerritsma

Rogalla

1994

Physica C: Superconductivity

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Negative differential resistance and quasiperiodic vortex-antivortex motion in a superconducting constriction

Ustavcshikov,

Levichev,

Pashenkin

et al. 2024

Phys. Rev. B

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Current-driven vortex dynamics in a periodic potential

et al. 1999

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Quasi-Josephson effects due to coherent vortex motion in artificial reversible periodic potential structures in high-T c superconducting thin films have been investigated. Periodic pinning conditions have been created by applying a magnetic tape containing a prerecorded harmonic signal to the surface of high quality Y 1 Ba 2 Cu 3 O 7Ϫ␦ thin films. Application of the periodic pinning enforces coherence in current-driven motion of Abrikosov vortices in wide and short macrobridges and leads to the appearance of Josephson-like effects manifesting themselves in series of self-induced current steps on the current-voltage characteristics. The equation of motion for vortices flowing across periodic potential structures is analogous to the phase equation for low-capacitance classical Josephson junctions. The perturbation solutions of this equation contain resonant Shapiro-like self-steps resulting from the locking of the frequency at which vortices are created at the sample borders to the resonant frequencies of the vortex system. Self-resonant frequencies are set by the characteristic time of flight across the sample width and across the period of the applied potential. Voltages of the selfinduced current steps have been found to scale with inverse of the characteristic length corresponding to the magnetic period and/or to the sample half-width, consistently with the theoretically derived relations. Experimental data indicate that vortices move in large bundles containing several thousands of flux quanta. The temperature dependence of the step voltages can be ascribed to changes in vortex velocity due to the temperature-dependent viscosity factor. ͓S0163-1829͑99͒01334-X͔

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Vortex motion and Josephson effect in superconducting microbridges in

Cited by 4 publications

References 11 publications

Coherent vortex motion in YBa2Cu3O7-δ nanobridges prepared by a substrate-etching technique

Coherent vortex motion in YBa2Cu3O7-δ nanobridges prepared by a substrate-etching technique

Negative differential resistance and quasiperiodic vortex-antivortex motion in a superconducting constriction

Current-driven vortex dynamics in a periodic potential

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