Abstract
One of the most important potential applications of the new high-temperature oxide superconductors is the superconducting quantum interference device (SQUID). We have made a d.c. SQUID using Josephson junctions made by engraving small constrictions (0.5×0.25 mm) in bulk YBa2Cu3O7–δ ceramics; we report here some of the magnetic properties observed. Shapiro steps and well defined quantum interferences between intrinsic junctions have been observed at 77 K. The critical current Ic is clearly modulated by the applied magnetic field. The measured field sensitivity is ∼1.2pT Hz−1/2 and is limited by the noise of the detection system; this value is certainly an underestimate of the true sensitivity of the device. The corresponding energy resolution lies in the range 10−29–10−30 J Hz−1.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Michel, C. et al. C.r. hebd. Séanc. Acad. Sci., Paris 304, II, 1059–1061 (1987).
Yan, M. F. et al. Appl. Phys. Lett. 51, 532–534 (1987).
Higashino, Y., Takahashi, T., Kawai, T. & Naito, S. J. appl. Phys. 7, L1211–L1213 (1987).
Colclough, M. S. et al. Nature 328, 47–48 (1987).
Moreland, J. et al. Appl. Phys. Lett. 51, 540–541 (1987).
Duret, D., Bernhard, P. & Zenatti, D. Rev. scient. Instrum. 46, 475–477 (1975).
Monfort, Y., Bloyet, D., Villegier, J. C. & Pascal, D. Revue Phys. appl. 19, 449–454 (1984).
Matthews, D. N., Bailey, A., Vaile, R. A., Russell, G. J. & Taylor, K. N. R. Nature 328, 786–787 (1987).
Bhargava, R. N., Herko, S. P. & Osborne, W. N. Phys. Rev. Lett. 59, 1468–1470 (1987).
Clarke, J. in Superconductor Applications: SQUIDS and Machines (eds Schwartz, B. B. & Foner, S. 67–124 (Plenum, New York, 1977).
Deutscher, G. & Muller, K. A. Phys. Rev. Lett. 59, 1745–1747 (1987).
Esteve, D. et al. Europhys. Lett. 3, 1237–1242 (1987).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Robbes, D., Monfort, Y., Sing, M. et al. The a.c. Josephson effect in constrictions engraved in bulk YBa2Cu3O7–δ and d.c. SQUID operation at 77 K. Nature 331, 151–153 (1988). https://doi.org/10.1038/331151a0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1038/331151a0
This article is cited by
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.
