Josephson junctions and superconducting quantum interference devices made by local oxidation of niobium ultrathin films

Bouchiat, V.; Faucher, M.; Thirion, C.; Wernsdorfer, W.; Fournier, T.; Pannetier, B.
July 2001
Applied Physics Letters;7/2/2001, Vol. 79 Issue 1, p123
Academic Journal
We present a method for fabricating Josephson junctions and superconducting quantum interference devices (SQUIDs) which is based on the local anodization of niobium strip lines 3-6.5 nm thick under the voltage-biased tip of an atomic force microscope. Microbridge junctions and SQUID loops are obtained either by partial or total oxidation of the niobium layer. Two types of weak link geometries are fabricated: lateral constriction (Dayem bridges) and variable thickness bridges. SQUIDs based on both geometries show a modulation of the maximum Josephson current with a magnetic flux periodic with respect to the superconducting flux quantum h/2e. They persist up to 4 K. The modulation shape and depth of SQUIDs based on variable thickness bridges indicate that the weak link size becomes comparable to the superconducting film coherence length ξ which is of the order of 10 nm. © 2001 American Institute of Physics.


Related Articles

  • Anodized niobium as barrier for Josephson tunnel junctions. Aponte, J.; Rivera, E.; Sa Neto, A.; Octavio, M. // Journal of Applied Physics;7/15/1987, Vol. 62 Issue 2, p700 

    Studies the formation of anodized niobium as barrier for niobium-NbO[subx]-lead Josephson tunnel junctions. Details on the fabrication of the junctions; Normal resistance of the junctions; Information on the average potential height.

  • Zero-crossing Shapiro step generated in an asymmetric and nonhysteretic rf-current-driven two-junction superconducting quantum interference device. Mizugaki, Yoshinao; Katoh, Kazuyuki // Journal of Applied Physics;9/15/2006, Vol. 100 Issue 6, p064503 

    A zero-crossing Shapiro step (ZCSS) in an asymmetric and nonhysteretic two-junction superconducting quantum interference device (SQUID) driven by one sinusoidal rf signal is presented. The operation is based on imbalanced evolution of the junction phases owing to the tilted interference...

  • Current-Phase Relation of Fully Characterized Atomic-Size Contacts. Dai, Zhenting; Marchenkov, Alexei // AIP Conference Proceedings;2006, Vol. 850 Issue 1, p761 

    We demonstrate a novel device geometry for experiments in superconducting atomic-size contacts (ASC) that allows to measure both their current-voltage (I–V) and current-phase (I([lowercase_phi_synonym])) characteristics. A mechanically controlled break junction (MCBJ) has been...

  • Stroboscopic single-shot detection of the flux state in a radio frequency superconducting quantum interference device. Cosmelli, C.; Sciamanna, F.; Castellano, M. G.; Leoni, R.; Torrioli, G.; Carelli, P.; Chiarello, F. // Applied Physics Letters;4/29/2002, Vol. 80 Issue 17, p3150 

    The flux states of a rf superconducting quantum interference device (SQUID) can be used to investigate macroscopic quantum effects, the most challenging of which is the detection of quantum coherent oscillations, and are promising candidates for the implementation of quantum computing. The use...

  • Equivalent parameters of a Josephson junction in a microwave SQUID structure. Vendik, O. G.; Danilov, I. S. // Technical Physics;Nov99, Vol. 44 Issue 11, p1360 

    The equivalent parameters of a Josephson junction in a microwave SQUID structure are calculated on the basis of relations obtained as a result of an analysis of the operation of an rf SQUID. This analysis is based on the sawtooth variation of the voltage on the resonator as a function of the...

  • High-T[sub c] multilayer step-edge Josephson junctions and SQUIDs. Missert, N.; Harvey, T.E. // Applied Physics Letters;9/20/1993, Vol. 63 Issue 12, p1690 

    Fabricates superconductor-normal metal-superconductor step-edge Josephson junctions and superconducting quantum interference devices. Reproducibility and uniformity of the junctions; Description of junctions grown on thin-film step edges of SrTiO[sub 3]; Discussion of critical currents of...

  • YBa[sub 2]Cu[sub 3]O[sub 7] ramp-type junctions and superconducting quantum interference devices.... Grundler, D.; Krumme, J.-P. // Applied Physics Letters;10/3/1994, Vol. 65 Issue 14, p1841 

    Presents a ramp-type Josephson junctions and superconducting quantum interference devices. Use of the ultrathin layer of NdGaO[sub 3] as weak contact; Exhibition of current-voltage characteristics of the resistivity-shunted-junction type; Display of hysteretic behavior below 70 Kelvin.

  • Development of high temperature superconducting Josephson junctions and quantum interference.... Reagor, D.; Houlton, R. // Applied Physics Letters;4/24/1995, Vol. 66 Issue 17, p2280 

    Develops high-temperature superconducting Josephson junctions and quantum interference devices in superconductor-normal-superconductor edge junction design. Use of ytrrium barium[sub 2]copper[sub 3]oxygen[ sub 7-x] for superconducting and normal layers; Difference in substrate temperature...

  • Enhanced quantum interference effects in parallel Josephson junction arrays. Miller Jr., J.H.; Gunaratne, G.H.; Huang, J.; Golding, T.D. // Applied Physics Letters;12/16/1991, Vol. 59 Issue 25, p3330 

    Demonstrates the enhanced quantum interference effects in parallel Josephson junction arrays. Function of applied magnetic flux; Enhancement and narrowing of the periodic principal maxima in the critical current; Application of the superconducting quantum interference grating.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics