Preparation and properties of YBa2Cu3O7-x thin-film SQUIDs

Catherine P. Foley; S. W. Filipczuk; John C. Macfarlane; David L. Dart; R. Driver

doi:10.1117/12.20885

1 October 1990 Preparation and properties of YBa2Cu3O7-x thin-film SQUIDs

Catherine P. Foley, S. W. Filipczuk, John C. Macfarlane, David L. Dart, R. Driver

Proceedings Volume 1287, High Tc Superconductivity: Thin Films and Applications; (1990) https://doi.org/10.1117/12.20885
Event: Advances in Semiconductors and Superconductors: Physics Toward Devices Applications, 1990, San Diego, CA, United States

Abstract

Thin films of YBa2Cu3O7_ deposited by ion-beam sputtering on yttria-stabilised zirconia (YSZ) substrates at room temperature have been lithographically patterned to form dc SQUID structures. Weak links are formed by naturally-occurring grain boundaries during annealing f the previously patterned films. These devices function either by he collective action of an array of weak links or by the action of a few dominating ones. Using a flux-locked-loop feedback circuit, we have obtained an upper limit for the SQUID noise of 1.5 x iO of the flux quantum per root Hz at 100 Hz in a SQUID of inductance 60 pH perating in liquid nitrogen. Critical currents averaged over the weak link cross-section are greater than iO" A/cm2 at 77 K. The performance of these devices is strongly dependent on temperature in the range 64-80 K. In this paper, we describe the preparation and properties of YBa2Cu3O7_ thin ifims and SQUID devices, and discuss further developments needed to improve the operating characteristics of these devices.

Citation Download Citation

Catherine P. Foley, S. W. Filipczuk, John C. Macfarlane, David L. Dart, and R. Driver "Preparation and properties of YBa2Cu3O7-x thin-film SQUIDs", Proc. SPIE 1287, High Tc Superconductivity: Thin Films and Applications, (1 October 1990); https://doi.org/10.1117/12.20885

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